A popstar gave up on social networking after a dinner party at which she realised she spent more time updating Twitter than interacting with her companions.
Online communities like Twitter, where people follow each other without being acquainted in real life, can be brutal: "If you're going to broadcast as a tweeter then you need to be thick skinned," says Dr Yeung, "If you're the kind of person who takes things personally, opening yourself up to criticism from strangers is not a good idea."
A Twitter user: "I could not fully concentrate on anything for longer than 20 minutes," says Carolyn. I simply had to check and update the feed. What if someone had asked a question of me? What if there was an interesting piece of information related to our experiment that I could read? It was highly distracting and I felt genuinely anxious."
"Everybody craves information," says applied psychologist Dr Lucy Atcheson, "It's what makes the world interesting. But you have to ask whether you need it all. Twitter has an element of making people feel important."
"You can get addicted to thinking that somebody is interested in your every move. You have this idea that there is a virtual audience. But when are you tweeting information, and when is it just vanity?"
Could you get by without Twitter? BBC.