British Prime Minister David Cameron has joined Twitter and sent his first tweet, immediately attracting tens of thousands of followers.

The leader, whose handle is (at)David_Cameron, says he will use the service to spread the word about his work as Conservative Party leader.

His first message on Sunday makes fun of his previous reluctance to use Twitter, saying "I promise there won't be 'too many tweets ...'"

Cameron had said in 2009 that he would steer clear of the site, but the trend proved has proved too popular to resist. Hundreds of other British lawmakers and politicians are on Twitter, with opposition Labour leader Ed Miliband boasting about 165,000 followers.