American boxer Muhammad Ali joins Twitter at 72

Boxing fans were in for a surprise when, on Tuesday, former American boxer, Muhammad Ali, 72, joined Twitter.

The boxing legend tweeted his first message, 50 years after he won his  first heavyweight title by defeating Sonny Liston.

“I shook up the world against Liston, now 50 years later I’m taking it to Twitter #AliTweet,” he wrote.