Long story short, Riot president Tryndamere promised us a reward if they hit 2M followers on FB, we hit that last year, earlier this year someone called him out on the reward, he said it's coming in May, then on the 31st they decided to give us bonus IP for the weekend, 1% for every 100K followers meaning 34% as they got 3,4M atm, people got pissed because 34% might as well be 0%, forum thread got downvoted to oblivion, Tencent's marketing experts evaluted that it was worth it to raise to 100% extra IP since it's just a weekend.
http://na.leagueoflegends.com/news/double-ip-weekend
http://euw.leagueoflegends.com/news/...ok-celebration
http://eune.leagueoflegends.com/news...ok-celebration
Enjoy your weekend folks