Yes, you missed quite a bit. They tried to block Twitter and Youtube, and then people started using Google DNS, OpenDNS or others to circumvent the block.

Some leaks about Erdogan's corruption and false flag attack in Turkey to blame Syria and go to war with it came out in those channels, and he wanted people to stop talking about it or see the leaks. I think some elections are in Turkey soon, too.

There have been some sound recording leaks in Turkey, exposing high ranking government officials' and Erdogan's private conversations, which is absolutely scandalous. This sunday, there will be an election, and the ruling party doesn't want people to listen to these records prior to the election. As you can guess, this material was primarily published through YouTube, hence the blockage.