pop culture vacuum

Lately I've been thinking about what it will be like when I go home. I've been gone for quite a while and even though I went to London in September I haven't left India in 7 months. I was talking with a few foreign colleagues who were in town about this and they said that I'm going to have crazy reverse culture shock.
Will the "normal" driving weird me out? Will the fact that I'm not a foreigner be strange? Will I miss the cows in the road? (aside: I saw the cutest little baby goat on the street the other day)
One thing I have a sneaking suspicion will stick out is how out of the loop I am with what is going on in the US. I've mentioned before that I live in a pop culture vacuum here. I remember coming back from living in France the week that the first series of Survivor was ending and it was all people were talking about and I was completely lost.
Now thanks to the internet I'm a bit more plugged in, but only slightly, I mean India really doesn't care what is happening in the US outside of the political side of things so I only get bits and pieces (aside #2: yes the internet existed back in 2000, but it wasn't used like it is now). One thing I've heard about on line which seems really big is twitter. I have no clue what it is but it seems to be the next big thing. I googled it to try and figure out what all the fuss is about but I'm convinced that what I read was wrong because it seems really idiotic so I feel like I'm missing something.
So I wonder, what else have I missed out on? Will I be able to slide into casual conversations easily or will I just sit there quietly wondering what on earth everyone is talking about. I guess I'll just have to wait and see, but it is kind of interesting how these huge cultural phenomenons can occur in such a short period of time and affect only a small percentage of the world's population.