A large increase in Spam Bots in the last two weeks.

I have noticed that there has been a large increase in spam bots adding me each day. Sometimes I get in excess of ten or more. I think I have a unique idea to slow down the huge amount of friend requests. Create some sort of Captcha system for adding friends. But instead of the same old system that we all hate, it could be a mini-game. To add a friend you have to identify league champions or perhaps play Wack-a-Teemo. Riot could get very creative with this idea, and it would surprise me if they weren't exploring such an option.