I don't have a problem with social games at all. I do however have a problem with some of your assumptions in your original posting:
I would go as far as to say originality is a core value of the indie game community.
I don't really think that's true personally. While there are certainly many innovative creators in the community my perception is that the majority of the output in the indie community is people taking their own stab at established genres and styles. I've seen just about every possible permutation of platformer and shoot'em'up come from the indie community and I don't feel like originality is always the creators goal nor is it required.
Indie games strive to be works of art; there is no question about that.
That's obviously a hot button topic around here from the amount of threads about games as art but once again I think "art games" are certainly a niche part of the indie community output as a whole. If you pick any of the high profile games like Spelunky, Super Meat Boy, VVVVVV they're all great games but none of them feel like an attempt to produce works of art to me.
The easiest game to make, and I may get some backlash from this but I believe it's true, is a game for yourself.
I don't think this point is so much wrong as you've come at it from the wrong angle. I don't feel like indies make games for themselves because it's easier I know personally that making games for myself is entirely the only reason to be an indie developer in the first place. If I tried to make games for a target audience then I might as well join the mainstream games industry.
I really don't have a problem with social games. My reason being that I love that the games industry as whole is becoming a much bigger and wider place which caters for gamers of all kinds and not just for people like FPS games. I think it's awesome that FarmVille exists, that tech like SingStar and Kinect get various audience playing on consoles who would hate a game like Fallout 3. It's also great that the DS has a whole host of games for teenage girls that I would never want to make or play myself. I have no reason to resent the existance of any of this stuff because it means more people get to enjoy games that suit them even if they're not something I'd enjoy playing myself.
I do have a problem with your characterisation of indies as this cliched imaged that we're all trying to scrape by making high art while we don't really worry about the money so much. Since that to me shows a lack of knowledge at the depth and breadth of what is actually being created and by whom.
So finally you mentioned apples and oranges in the original post. Here's what I really don't get. Why this matters? Because I don't feel like in general the indie community gets on that well with the makers of Call of Duty or GTA either. I feel like if you take a general view on it I've found a lot of indie developers focus a lot of their love on other indie games. Which makes a lot of sense since those are the kind of games they make and are into. So I don't think it matters if people dislike Facebook gaming.
When you've spend a year working on a weird offbeat game because it's just the thing you always wished someone would make then no maybe you don't like FarmVille, but so what?