Microblogging site Twitter may have started back in 2006, but 2011 is undoubtedly the year when it really took off.
It's the best place to go for breaking news and comment straight from the stars themselves and to celebrate Twitter's success in 2011, we take a look at its #YearInReview and the most Tweeted-about stars of the year.
So why not relive the most-tweeted about celebrity moments of 2011, social networking-style with our run-down...
Scientists are appealing for more people to donate their brains for research after they die.
Life on Earth may have arrived from Mars on an asteroid, scientists have claimed.
Lunar mission scheduled at the end of 2017 could find out if beer can be brewed on the moon.
A bottle used to teach children how far litter can travel ended up on Scottish beach after 8,700-mile journey.
Confused Apple customers are finding coins in their MacBooks.
High levels of iron help prevent hearing loss, a study has claimed.
A software engineer has constructed a fingernail-sized engine made of paper and it totally works!
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