The eldest child of John McCain, the Republican presidential candidate during last year's US election, has launched a foul-mouthed and extended defence of herself on the "microblogging" service Twitter after she was accused of having accomplished nothing in her life. Meghan McCain, 24, used her Twitter account, which limits users to messages of no more than 140 characters, to send out a long string of "tweets" in which she listed her achievements. The curriculum vitae apparently includes teaching children at church, delivering flowers to hospital patients, and writing a best-selling children's book about her father's life.