Meanwhile, Ke$ha shocked fans with a snap of herself urinating on the side of the street and an underwear-clad Helen Flanagan caused a furore by retweeting a picture of herself holding a gun to her head.
Happier moments on social media sites included Robbie Williams introducing newborn daughter Theodora Rose to the world and Girls Aloud reuniting to celebrate their ten year anniversary.
We take a look back at 20 of the best, worst and most controversial Twitter pictures of 2012:
Rihanna shares a picture of her arm hooked up to a drip on Twitter, without a caption or any explanation back in May.
1 of 20
Copyright: Twitter
