What lane were you in? Was the Nunu (yeti guy on your team) jungling? (he doesn't seem to have been indexed by lolking yet so I can't tell)
It depends on the 2v1 situation - if it was a matter of someone from another lane (or jungle) roaming into your lane that's the time to ward. (I'll go into details of why/when/where once I get some time)
If it was 2v1 in lane (they had two people sitting there and you didn't have a lane partner) you need to play the dirty 2v1 dance. You're basically going to ward the lane bush closest to your tower (assuming one of them is camping in there and pressuring you from it) and you're going to try to farm as best you can without being forced out of lane. Your teammates should be helping you when they can with ganks/watching tower when you're forced out, but at low levels don't expect much.
Right now in 2v1 lanes their goal is to kill you/force you out of lane and push your tower down as early as possible; your goal is to stay in lane safely as long as possible while maximizing the CS (creep score) you can get. They're splitting experience and farm in lane, so once mid/late game hits you'll be ahead in levels and hopefully close to even in gold.
I have no idea what he was doing honestly.
I was playing the right lane (bottom?) and it was two players constantly in my lane. So basically, sit back and defend the tower vs. trying to push forward. Next game it happens I'll give it a try.
Played Blitz a few matches. There are so many awesome ways to fuck with people xD If you're blue, go in the corner by the purple wolves. It's grab heaven. Enemy team surrendered after I did it 17 times in a row >.> each resulting in a kill for me or my team. lolol
I now have a new idea. >.>