#BBCtrending radio: 'Nice pic. Phwoar' and more Twitter gaffes
6 January 2014 Last updated at 09:56 GMT
2013 was a year full of cringeworthy embarrassment for big companies trying to look good on social media.
This week, #BBCtrending radio re-tells the stories of how McDonald's, Tesco, Ryanair and others engaged with the public - and sometimes fell flat. Anne-Marie Tomchak speaks to the head of social media for Ryanair, whose CEO Michael O'Leary tweeted "Nice pic. Phwoar" during a real social media engagement session.
So what are the secrets of looking good on social media? Esra Dogramaci, digital consultant for the BBC, joins us in the studio.