why can't I download facebook on my ipod touch?

[Ayla]

So, I've had my iPod for a good 3 years now, and back when I had a different internet server with a wifi connection I was able to download Facebook, etc. Anyways after sometime I dropped the server I was with and I'm now with century link, after having it for some time I've now discovered my iPod will run on this server lol. ANYWAYS! I tried downloading Facebook and Kik messenger on my iPod and it's telling me I must update to ios 6 in order to download these apps ? Um, before I never had a problem downloading Facebook but now I do. Don't tell me I literally would have to buy a newer version to download this app? lol if I do that would totally suck. If not, is there a way I can update my iPod, so that it will download these apps? It's been so long sense I've used it. It's been sitting around collecting dust.