Having heaps of Facebook friends may make you look popular, but is actually a source of stress, researchers say.
About a third of a million more Americans showed up at the ballot box in 2010 because of a single Facebook message on election day, say researchers at the University of California, San Diego.
Your friends' tweets may be giving away more information about you than you realise, say sneaky computer scientists at the University of Rochester.
Be careful who you friend: an Israeli researcher is claiming that international terrorist organizations are increasingly focusing on social media as a way of drumming up support.
When it comes to Facebook, it seems we're not all linked by six degrees of separation - the true figure is actually 4.74.
Men are mugs when it comes to Facebook, it seems, engaging in far riskier behaviour and making themselves much more vulnerable to data theft.
There's a direct link between the number of Facebook friends a person has and the size of particular brain regions, say researchers at University College London (UCL).
Facebook may have an ally in the looming war with Google+ and its Circles feature, in the form of an app which arranges Facebook friends into subgroups - automatically.
Just how knowledgeable are your friends? Because Facebook's relaunching its Questions Q&A site to give more prominence to information from friends, and less to answers from the general public.
An - admittedly small - survey of 407 Facebook-using dog owners has revealed that many dogs have more Facebook friends than you or me.
The more Facebook friends you've got, the more likely you are to feel stressed out by the site, say psychologists from Edinburgh Napier University.
Developing countries are the most enthusiastic users of social networking, according to a new survey of over 50,000 people worldwide.
It's terribly sad, but it seems that the more time you spend trying to be friendly on Facebook, the more likely you are to be unfriended.
Twitter's launched a new feature along the lines of Facebook's friend suggestions, designed to help users find others with similar interests.
Facebook has reportedly fixed a critical security flaw that briefly allowed users to view the live chats of their friends and see pending friend requests.