The document discusses different TV channels in the UK and their target audiences. It provides information on channels such as the BBC, ITV, Channel 4, Channel 5, and their digital counterparts. The BBC channels include BBC One for mainstream audiences, BBC Two for more educated audiences, BBC Three for younger audiences aged 16-34, and BBC Four for older audiences. ITV targets mass audiences and airs dramas, soaps and reality shows. Channel 4 follows public service broadcasting and airs documentaries after watershed. The document analyzes each channel's programming and demographic to choose BBC Three as the best channel for a documentary on social networking due to its younger target age range.