(sidenote: I'm rounding up my favorite iphone apps for a different post but i thought instagram deserved its own.)
At first, I just used it to take photos and put fun filters on them but then I realized the whole social networking part of it is the most fun. It's like twitter with photos. An exclusive little iphone community!
Not to mention, the filters are the best of any iphone camera app i've used so far. And the tilt shift feature is really fun to play with.
The best part, its free. Need I say more??
If you don't have instagram, get it! And if you do, come find me and lets be instagram friends. My username is vanillaandlace.