In LinkedIn We Trust 
??? 
“In data analysis we trust” 
- a case study 
Mei Lu 
Founder & CEO 
Geekology.biz 
Sourcing 7 
Fall 2014 Shareback 
@ Amazon
Account types 
Breakdown
It looks like 
we 
A LOT
Is 
trust-worthy 
?
“Trust, but verify”
A simple 
experiment
Step 1: 
Find a Job Posting
Software Developer - Chicago 
Requirements: 
• 2-3 years of experience writing software 
with Ruby 
• 2-3 years of web development 
experience with Ruby on Rails or Sinatra 
• Direct experience with the development 
and maintenance of large-scale, mission-critical 
web applications 
• Experience with TDD and BDD
Software Developer - Chicago 
Requirements: 
• 2-3 years of experience writing software 
with Ruby 
• 2-3 years of web development 
experience with Ruby on Rails or Sinatra 
• Direct experience with the development 
and maintenance of large-scale, mission-critical 
web applications 
• Experience with TDD and BDD
Step 2: 
- Use your basic (free) 
LinkedIn account. 
- Search.
LinkedIn Advanced Search: 
Keywords: ruby rails sinatra tdd bdd 
Location: "Greater Chicago Area“
Step 3: 
- Find a search 
engine. 
- X-ray search 
LinkedIn profiles.
site:www.linkedin.com "location * greater 
chicago area" ruby rails sinatra tdd bdd
The moment of truth - 
comparing results
In LinkedIn We Trust??? (to Source Our Candidates)
In LinkedIn We Trust??? (to Source Our Candidates)
19 = 19 
The End ???
Numbers 
alone 
don’t tell 
the 
whole 
story 
WHY, BRAD DARLINseGa,rchI FEEL 
SOMETHING’S MISSING FROM THIS 
PICTURE.
Time to do 
some 
detective 
work
Name LinkedIn Google X-ray 
Alex Kowalczuk x 
Brandon Bailey x x 
Calder Wishne x x 
Dan Melnick x x 
Darby Frey x 
Eduardo Garibay x x 
Ismail Kalimi x 
Jake Sikora x 
James Fraser x 
Jason Perkins x 
Jazmin Schroeder x 
JD Kaplan x 
Joshua Davey x x 
Justin Joseph x 
Keenan Turner x 
Kevin Horst x xx 
Marek Pyczkowski x 
Nate Delage x x 
Nickolay Schwarz x 
Randy Burgess x 
Ryan Kinderman x 
Shawn Klein x x 
Shinji Kuwayama x 
Stephen Wooten x 
Ted Price x xx 
Zach Briggs x 
Zachary Rivest x x
Name LinkedIn Google X-ray 
Alex Kowalczuk x 
Brandon Bailey x x 
Calder Wishne x x 
Dan Melnick x x 
Darby Frey x 
Eduardo Garibay x x 
Ismail Kalimi x 
Jake Sikora x 
James Fraser x 
Jason Perkins x 
Jazmin Schroeder x 
JD Kaplan x 
Joshua Davey x x 
Justin Joseph x 
Keenan Turner x 
Kevin Horst x xx 
Marek Pyczkowski x 
Nate Delage x x 
Nickolay Schwarz x 
Randy Burgess x 
Ryan Kinderman x 
Shawn Klein x x 
Shinji Kuwayama x 
Stephen Wooten x 
Ted Price x xx 
Zach Briggs x 
Zachary Rivest x x 
LinkedIn 
Exclusive 
Google 
X-ray 
Exclusive 
Both 
10 
8 
9 
Total 27 19 17
Question: 
Why are there profiles 
only in Google X-ray, 
but not in LinkedIn?
1. 
Google shows us both 
“TDD” and 
“Test Driven Development”
2. 
Google shows us 
some profiles with 
one keyword (bdd, Sinatra) 
missing
Name LinkedIn Google X-ray 
Alex Kowalczuk (missing bdd) 
Brandon Bailey x x 
Calder Wishne x x 
Dan Melnick x x 
Darby Frey x 
Eduardo Garibay x x 
Ismail Kalimi x 
Jake Sikora (missing bdd) not really 
James Fraser x 
Jason Perkins x 
Jazmin Schroeder x 
JD Kaplan x 
Joshua Davey x x 
Justin Joseph x 
Keenan Turner x 
Kevin Horst x xx 
Marek Pyczkowski x 
Nate Delage x x 
Nickolay Schwarz x 
Randy Burgess (missing bdd) 
Ryan Kinderman (missing Sinatra) 
Shawn Klein x x 
Shinji Kuwayama x 
Stephen Wooten x 
Ted Price x xx 
Zach Briggs x 
Zachary Rivest x x 
LinkedIn 
Exclusive 
Google 
X-ray 
Exclusive 
Both 
10 
8 4 
9 
Total 19 17 13 
Should it count??? 
Cleaning 
Up 
Google 
X-ray 
Results 
23
Still… 
There are 4 results 
only in Google X-ray, 
but not in LinkedIn
What if we make our 
Boolean string better? 
TDD -> 
(TDD OR “test driven development”) 
BDD -> 
(BDD OR “behavior driven development”)
LinkedIn Advanced Search: 
Keywords: ruby rails sinatra (tdd OR “test driven 
development”) (bdd OR “behavior driven 
development”) 
Location: "Greater Chicago Area“
In LinkedIn We Trust??? (to Source Our Candidates)
Name LinkedIn w/ Basic Boolean LinkedIn w/ Better Boolean 
Andrew Larson x 
Brandon Bailey x x 
Calder Wishne x x 
Dan Melnick x x 
Darby Frey x 
Eduardo Garibay x x 
Eugene Filimonov x 
Ismail Kalimi x x 
Jake Sikora x 
James Fraser x x 
Jason Perkins x x 
Jazmin Schroeder x 
JD Kaplan x x 
Joshua Davey x x 
Justin Joseph x x 
Justin Park x 
Keenan Turner x x 
Kevin Horst x x 
Marek Pyczkowski x x 
Milan Grubnić x 
Nate Delage x x 
Nickolay Schwarz x x 
Shawn Klein x x 
Shinji Kuwayama x 
Stephen Wooten x 
Stuart Pearlman x 
Ted Price x x 
Xander Glassman x 
Zach Briggs x x 
Zachary Rivest x x 
All gain; 
no loss. 
Yay! 
Better 
Boolean 11 
Both 
19
How about Google X-ray 
with the better Boolean 
string? 
site:linkedin.com "location * greater 
chicago area" ruby rails sinatra 
(tdd OR "test driven development") 
(bdd OR "behavior driven development")
Name Google w/ Basic Boolean Google w/ Better Boolean 
Alex Kowalczuk missing bdd 
Andrew Larson x 
Brandon Bailey x x 
Calder Wishne x x 
Dan Melnick x 
Darby Frey x x 
Eduardo Garibay x x 
Eugene Filimonov x 
Jake Sikora missing bdd (not really) x 
Jazmin Schroeder x x 
Joshua Davey x 
Justin Park x 
Kevin Horst xx xx 
Nate Delage x x 
Randy Burgess missing bdd 
Ryan Kinderman missing bdd 
Shawn Klein x x 
Shinji Kuwayama x x 
Stephen Wooten x x 
Ted Price xx xx 
Zachary Rivest x x 
Total 17 17 
Same 
numbers of 
results. 
But cleaner. 
Gain w/ 
Better 
Boolean 
Loss w/ 
Better 
Boolean 
4 
4
Final SHOWDOWN 
Best of 
LinkedIn Advanced Search (Free Account) 
and 
Google X-ray Search of LinkedIn
Name LinkedIn (30) Google (17) 
Andrew Larson x x 
Brandon Bailey x x 
Calder Wishne x x 
Dan Melnick x 
Darby Frey x x 
Eduardo Garibay x x 
Eugene Filimonov x x 
Ismail Kalimi x 
Jake Sikora x x 
James Fraser x 
Jason Perkins x 
Jazmin Schroeder x x 
JD Kaplan x 
Joshua Davey x x 
Justin Joseph x 
Justin Park x x 
Keenan Turner x 
Kevin Horst x xx 
Marek Pyczkowski x 
Milan Grubnić x 
Nate Delage x x 
Nickolay Schwarz x 
Shawn Klein x x 
Shinji Kuwayama x x 
Stephen Wooten x x 
Stuart Pearlman x 
Ted Price x xx 
Xander Glassman x 
Zach Briggs x 
Zachary Rivest x x 
LinkedIn 
Exclusive 
Google 
X-ray 
Exclusive 
Both 
13 
0 
17
What have we learned? 
1.LinkedIn searches literally while Google 
searches fluidly 
2.Google tries to help us by including 
synonyms behind the scene 
3.When we compose thorough and 
comprehensive Boolean strings, LinkedIn 
outperforms Google X-ray (at least in this 
study)
Case closed? 
Not so fast… 
The next set of questions 
already surfaced
How much can we rely on Google 
to improve our Boolean search 
strings? 
Why did Google fail to find some 
profiles? 
Would a paid LinkedIn account give 
us more (and exhaustive) results?
Questions? 
Special thanks to Amybeth Quinn 
Mei Lu 
Geekology.biz 
@g33kology

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In LinkedIn We Trust??? (to Source Our Candidates)

  • 1. In LinkedIn We Trust ??? “In data analysis we trust” - a case study Mei Lu Founder & CEO Geekology.biz Sourcing 7 Fall 2014 Shareback @ Amazon
  • 3. It looks like we A LOT
  • 7. Step 1: Find a Job Posting
  • 8. Software Developer - Chicago Requirements: • 2-3 years of experience writing software with Ruby • 2-3 years of web development experience with Ruby on Rails or Sinatra • Direct experience with the development and maintenance of large-scale, mission-critical web applications • Experience with TDD and BDD
  • 9. Software Developer - Chicago Requirements: • 2-3 years of experience writing software with Ruby • 2-3 years of web development experience with Ruby on Rails or Sinatra • Direct experience with the development and maintenance of large-scale, mission-critical web applications • Experience with TDD and BDD
  • 10. Step 2: - Use your basic (free) LinkedIn account. - Search.
  • 11. LinkedIn Advanced Search: Keywords: ruby rails sinatra tdd bdd Location: "Greater Chicago Area“
  • 12. Step 3: - Find a search engine. - X-ray search LinkedIn profiles.
  • 13. site:www.linkedin.com "location * greater chicago area" ruby rails sinatra tdd bdd
  • 14. The moment of truth - comparing results
  • 17. 19 = 19 The End ???
  • 18. Numbers alone don’t tell the whole story WHY, BRAD DARLINseGa,rchI FEEL SOMETHING’S MISSING FROM THIS PICTURE.
  • 19. Time to do some detective work
  • 20. Name LinkedIn Google X-ray Alex Kowalczuk x Brandon Bailey x x Calder Wishne x x Dan Melnick x x Darby Frey x Eduardo Garibay x x Ismail Kalimi x Jake Sikora x James Fraser x Jason Perkins x Jazmin Schroeder x JD Kaplan x Joshua Davey x x Justin Joseph x Keenan Turner x Kevin Horst x xx Marek Pyczkowski x Nate Delage x x Nickolay Schwarz x Randy Burgess x Ryan Kinderman x Shawn Klein x x Shinji Kuwayama x Stephen Wooten x Ted Price x xx Zach Briggs x Zachary Rivest x x
  • 21. Name LinkedIn Google X-ray Alex Kowalczuk x Brandon Bailey x x Calder Wishne x x Dan Melnick x x Darby Frey x Eduardo Garibay x x Ismail Kalimi x Jake Sikora x James Fraser x Jason Perkins x Jazmin Schroeder x JD Kaplan x Joshua Davey x x Justin Joseph x Keenan Turner x Kevin Horst x xx Marek Pyczkowski x Nate Delage x x Nickolay Schwarz x Randy Burgess x Ryan Kinderman x Shawn Klein x x Shinji Kuwayama x Stephen Wooten x Ted Price x xx Zach Briggs x Zachary Rivest x x LinkedIn Exclusive Google X-ray Exclusive Both 10 8 9 Total 27 19 17
  • 22. Question: Why are there profiles only in Google X-ray, but not in LinkedIn?
  • 23. 1. Google shows us both “TDD” and “Test Driven Development”
  • 24. 2. Google shows us some profiles with one keyword (bdd, Sinatra) missing
  • 25. Name LinkedIn Google X-ray Alex Kowalczuk (missing bdd) Brandon Bailey x x Calder Wishne x x Dan Melnick x x Darby Frey x Eduardo Garibay x x Ismail Kalimi x Jake Sikora (missing bdd) not really James Fraser x Jason Perkins x Jazmin Schroeder x JD Kaplan x Joshua Davey x x Justin Joseph x Keenan Turner x Kevin Horst x xx Marek Pyczkowski x Nate Delage x x Nickolay Schwarz x Randy Burgess (missing bdd) Ryan Kinderman (missing Sinatra) Shawn Klein x x Shinji Kuwayama x Stephen Wooten x Ted Price x xx Zach Briggs x Zachary Rivest x x LinkedIn Exclusive Google X-ray Exclusive Both 10 8 4 9 Total 19 17 13 Should it count??? Cleaning Up Google X-ray Results 23
  • 26. Still… There are 4 results only in Google X-ray, but not in LinkedIn
  • 27. What if we make our Boolean string better? TDD -> (TDD OR “test driven development”) BDD -> (BDD OR “behavior driven development”)
  • 28. LinkedIn Advanced Search: Keywords: ruby rails sinatra (tdd OR “test driven development”) (bdd OR “behavior driven development”) Location: "Greater Chicago Area“
  • 30. Name LinkedIn w/ Basic Boolean LinkedIn w/ Better Boolean Andrew Larson x Brandon Bailey x x Calder Wishne x x Dan Melnick x x Darby Frey x Eduardo Garibay x x Eugene Filimonov x Ismail Kalimi x x Jake Sikora x James Fraser x x Jason Perkins x x Jazmin Schroeder x JD Kaplan x x Joshua Davey x x Justin Joseph x x Justin Park x Keenan Turner x x Kevin Horst x x Marek Pyczkowski x x Milan Grubnić x Nate Delage x x Nickolay Schwarz x x Shawn Klein x x Shinji Kuwayama x Stephen Wooten x Stuart Pearlman x Ted Price x x Xander Glassman x Zach Briggs x x Zachary Rivest x x All gain; no loss. Yay! Better Boolean 11 Both 19
  • 31. How about Google X-ray with the better Boolean string? site:linkedin.com "location * greater chicago area" ruby rails sinatra (tdd OR "test driven development") (bdd OR "behavior driven development")
  • 32. Name Google w/ Basic Boolean Google w/ Better Boolean Alex Kowalczuk missing bdd Andrew Larson x Brandon Bailey x x Calder Wishne x x Dan Melnick x Darby Frey x x Eduardo Garibay x x Eugene Filimonov x Jake Sikora missing bdd (not really) x Jazmin Schroeder x x Joshua Davey x Justin Park x Kevin Horst xx xx Nate Delage x x Randy Burgess missing bdd Ryan Kinderman missing bdd Shawn Klein x x Shinji Kuwayama x x Stephen Wooten x x Ted Price xx xx Zachary Rivest x x Total 17 17 Same numbers of results. But cleaner. Gain w/ Better Boolean Loss w/ Better Boolean 4 4
  • 33. Final SHOWDOWN Best of LinkedIn Advanced Search (Free Account) and Google X-ray Search of LinkedIn
  • 34. Name LinkedIn (30) Google (17) Andrew Larson x x Brandon Bailey x x Calder Wishne x x Dan Melnick x Darby Frey x x Eduardo Garibay x x Eugene Filimonov x x Ismail Kalimi x Jake Sikora x x James Fraser x Jason Perkins x Jazmin Schroeder x x JD Kaplan x Joshua Davey x x Justin Joseph x Justin Park x x Keenan Turner x Kevin Horst x xx Marek Pyczkowski x Milan Grubnić x Nate Delage x x Nickolay Schwarz x Shawn Klein x x Shinji Kuwayama x x Stephen Wooten x x Stuart Pearlman x Ted Price x xx Xander Glassman x Zach Briggs x Zachary Rivest x x LinkedIn Exclusive Google X-ray Exclusive Both 13 0 17
  • 35. What have we learned? 1.LinkedIn searches literally while Google searches fluidly 2.Google tries to help us by including synonyms behind the scene 3.When we compose thorough and comprehensive Boolean strings, LinkedIn outperforms Google X-ray (at least in this study)
  • 36. Case closed? Not so fast… The next set of questions already surfaced
  • 37. How much can we rely on Google to improve our Boolean search strings? Why did Google fail to find some profiles? Would a paid LinkedIn account give us more (and exhaustive) results?
  • 38. Questions? Special thanks to Amybeth Quinn Mei Lu Geekology.biz @g33kology