But the social media gathering place du jour does have its downside - and not just the millions of pounds worth of work time it is sucking out of the economy.
Canny employers are using the website to track the lives of staffers and potential new employees. And PR firms are leading the way.
Brands2Life HR manager Jacqueline Thompson was quoted in The Times this week, in a piece on the procrastination tool. She said her agency turned down a job applicant after learning he had used the social networking site to 'criticise previous employers and discuss company information'.
Current Brands2Life staffers, consider this a warning - remove those images of your 'experimental' university days quickly. And set your page to private.