Twitter’s first star

Thanks to her gift for 140-character witticisms, Kelly Oxford has transformed herself from Canadian stay-at-home mum to Los Angeles-based bestselling author and screenwriter. Hermione Hoby meets the woman all the celebrities follow

Are these the worst apps ever?

Huggies Brazil has launched a new app that tweets you to tell you when your baby has wet its nappy. Think that's bad? Well, there are possibly worse ones, writes Stuart Heritage

Warren Buffett has tweeted

Katie Rogers: Five definitive articles about the billionaire investor joining Twitter, and then … wait for it … tweeting something