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Commentluv rewards your readers by automatically placing a link to their latest blog post at the end of their comment.  Encourage a community and discover new posts.

Roboform password management - this plugin for Chrome allows you to store your passwords in one location, allowing login to all your services from anywhere.

Great personal bookmarking system for reading things later. Works well with ifttt and has apps for mobile / plugins for Twitter.

Inboxq find questions being asked in social media (Twitter) by recognising questions around the keywords you provide.  You can also refer a question to your trusted contacts, for them to answer, and create new, targeted connections as a result

Make your website social - allow visitors to share from within your site, aiding link-building and SEO, as well as social discoverability.

See users social profiles and more about them, from within Gmail - displays alongside incoming email