Twitter to start including videos in tweets from Vine: http://mashable.com/2013/01/23/twitter-vine-videos/

LinkedIn's fastest growing group is Social Media Marketing: http://www.prnewswire.com/news-releases/fastest-growing-group-on-linkedin-is-social-media-marketing----international-trend-in-social-media-fueling-the-growth-188204151.html

Now, the Facebook news:

Facebook's mobile app was the US's most popular in 2012: http://www.comscore.com/Insights/Blog/Facebook_Vaults_Ahead_of_Google_Ma...

Personal analytics for Facebook, by Wolfram Alpha: http://blog.wolframalpha.com/2013/01/23/introducing-expanded-personal-an...

Finding humor in Graph Search queries: http://actualfacebookgraphsearches.tumblr.com/

Can you kill your Facebook addiction? http://www.dailydot.com/society/facebook-addiction-faddict-30-day-challe...