Twitter is the fastest growing social platform out there: http://globalwebindex.net/thinking/twitter-now-the-fastest-growing-social-platform-in-the-world/
France renames hashtags: http://mashable.com/2013/01/29/france-renames-twitter-hashtag/
Foursquare releases app for small businesses: http://venturebeat.com/2013/01/29/foursquare-finally-gives-small-business-owners-their-own-app/
Facebook vetoes Yandex's social graph app: http://techcrunch.com/2013/01/30/wonder-no-more-yandex-says-facebook-has-given-a-final-no-on-graph-api-usage-will-pull-its-social-app/
Check your Facebook page's barometer for free: http://thenextweb.com/apps/2013/01/30/agora-pulse/