ThinkUp is a free, open source PHP/MySQL app that you install on your web server to collect and store all of your activity on social networks like Twitter, Facebook and Google+. It can be used to search and backup your own social nework activities, create a time capsule of online activity, analyze social media discussions, or create a more interactive discussion. [via mefi projects]
http://www.metafilter.com/109928/ThinkUp-reclaim-and-analyze-social-network-activities
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