Measure influence - in this context, a user's ability to move content across the social web. Measures FB, Twitter, Linkedin and Google+ (with ither networks providing limited influence on scores)
Kred - Measures influence based on the propensity of others to share your content and mention you, as well as your outgoing engagement (Mentions and RT's for Twitter, for example)
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
Twitter productivity tool - allows scheduling of messages, and a variety of other tools to help you "be" in Twitter without actually being there! Apply caution - People like true engagement! (Well durrr)
Shortstack allows free, professional custom tabs for your Facebook Page - includes templates for Pinterest tabs, promotions & sweepstakes, customer details capture (opt-in), and more.
Facebook customaisation and marketing tools - custom tabs and Pages, including options for "fan gates", opt-in/detail capture, competitions, promotions, sweepstakes - Free, to a point