I've got to say, I really like seeing so many people showing their support. Especially since I know that all the red I see as I scroll through my Facebook feed doesn't represent all who are in favor of equal rights.
The one downside is that it's making me take slightly longer to figure out who's who on Facebook. I normally go by profile pics, which of course doesn't work when everyone has the same (or similar looking) red equals sign. Then again, I guess I can't really complain. :)