A social network service uses software to build online social networks for communities of people who share interests and activities or who are interested in exploring the interests and activities of others. Most services are primarily web-based and provide a collection of various ways for users to interact, such as chat, messaging, email, vidoe, voice chat, file sharing, blogging, discussion groups and so on.
Information Services provide guidance on the use of social networking
Facebook for educators http://facebookforeducators.org/groups
Tips to use Facebook groups to promote research http://tinyurl.com/7zzqnyf
10 tips for effectively using your LinkedIn status update http://www.careerealism.com/linkedin-10-tips-effectively-status-update
LinkedIn: How to use LinkedIn http://jobsearch.about.com/od/networking/a/linkedin2.htm
Why use LinkedIn? Newcastle researchers blog http://newcastleresearchers.wordpress.com/2010/11/18/why-use-linkedin/
University of Leeds Careers Centre have developed a series of videos on how to get the most out of LInkedIn