How good is your knowledge of internet memes and trends? If you can work out 20 crazy, significant and remarkable things that happened on the internet in 2013 from this poster, you're doing well. Digital agency Syzygy commissioned Barcelona-based brothers Juan and Alejandro Mingarro from Brosmind Studio to create the online illustration as a review of last year, and is asking people to guess the answers via social media. Clues will be released every few days, and the full list of answers a week later. In the meantime, anyone who tweets the link with the hashtag #20Things will enter a draw to win signed copies of the poster. In case it helps, there are animated versions of each clue on this Tumblr.