So quickly, shame on you all for turning this from a potential security problem into a "oh no, you used a summoner name" discussion. It was fairly stated giving the names of everyone on both teams, good job, everyone stop crying now.
I had a game a while back where I was jungling, no matter where I went, or how I tried to gank, the enemy alistar was there with the laner shortly behind him. This happened to everyone throughout the game, the enemy team knew where all of us were at all times, I could rationalize a few chance encounters easily enough, but it was impossible for any of our team to get ANYWHERE because they all knew where we were and would show up. A friend spectating the game said they hadn't purchased or placed a single ward the whole game. I thought this was a cheat, but I was then told that it's pretty much impossible to hack LoL because of how data is handled by the servers. Not sure if this is true or not, but it might have just been bad luck in both my instance and yours.