Symeon Papadopoulos

social media mediaeval verification twitter multimedia clustering social event detection community detection multimedia retrieval image forensics geotagging online disinformation multimedia verification benchmarking image tampering fake news deep learning events flickr social networks deepfakes debunking privacy hoax sentiment analysis machine learning semi-supervised learning multimedia forensics dataset video retrieval topic detection journalism video search convolutional neural networks evaluation social news gans media verification deepfake detection indexing social multimedia language models near-duplicate detection topic discovery generative adversarial networks hurricane sandy image retrieval supervised learning cbir visual words image indexing event mining lda summarization topic modeling online communities event indexing multimodal clustering film festival graph-based clustering online social networks news discovery classification sed supervised clustering event discovery geo text indexing landmarks tagging photo collections dawak folksonomy tag clustering mediaeval2011 sed2011 event detection tagged photos collective intelligence project results weknowit graphs flickr photos clusttour city exploration mobile mmsys tiff53 thessfest tedxthess tdf14 apps mir-flickr multimedia fusion concept detection multimedia annotation online learning sed2012 icmr2012 εξόρυξη γνώσης κοινωνικά δίκτυα διατριβή web applications jdbc air quality estimation opportunistic sensing social sensing rumour cascades media literacy photoshopping detection image authentication fact checking vggnet alexnet googlenet mediaeval2016 acmmm16 inferences multimedia privacy acmmm2016 data protection placing task mmcommons synthetic media weverify ai4media cybersecurity face swap faceswap video forensics content authentication forgery detection splicing detection media forensics manipulation contact tracing covid-19 infodemic misinformation predictive modeling feature extraction hackair query formulation relevance classification multimedia search revealproject ner social media mining ensemble learning polarity classification neo4j titan orientdb graph databases analytics mining mongo solr trending topic detection snow2014 www2014 yfcc100m user profiling information disclosure personal information user study social science user-generated content icwsm2016 smnews splicing news prediction comment mining popularity prediction controversiality popularity diverse image retrieval location detection splice detection user classification data challenge