Heavy users - sometimes called "stoners" - may continue testing positive for a month after last smoking pot.

The video was posted on YouTube on Dec 20 by a user called saule540.

Instead, users of the service, called netCD, could purchase the music online, then keep the songs stored on MP3.com's computer servers.

The video, posted by a user called amerking has been viewed more than 1 million times in a week.

Fetch details for a particular user called joe:

The current "mayor" of Tiananmen Square is a Foursquare user called Chommy.

It also provides several free tools relating to its core commercial products, and hosts an online community of more than 93,000 users called thwack.

Habitual users of a new, free communications service called Twitter would disagree.

A user called darkillzhou told a joke that was widely forwarded.

There are some games specifically reserved for a premium tier of users, called Deluxe Membership.