There is a range of social networking extensions, supporting the different social networking functions:
- Displaying channels - ie image icon links to your social network channels such as Facebook, Google Plus, Twitter to encourage users to follow you
- Share/bookmarking - Encouraging your readers to share particular content/links to their social networks
- Social commenting - Allowing users to comment on your articles using social comment networks such as Facebook, Disqus
- Displaying Social Network feeds - displaying twitter or facebook feeds on your site
- Social Logins - allowing users to login to your site using their social network logins
See a Squidoo article on recommendations for the different functions.