How so? They're not doing anything in that direction as far as I know. Is this just your suggestion that it would be a good use case for them to pursue?
> I think trying to get into the dating business would be a terrible mistake for Facebook.
Why? Facebook could do it a lot better than any of the existing dating-only sites with the info they have on everyone's social graph and their high penetration. They probably wouldn't want to come out and blatantly add a "dating" feature, but instead just add features that "happen" to facilitate dating use-cases. A lot more people would be willing to do internet dating if it wasn't explicitly "internet dating", but instead just happened as an organic process on a site they were already a part of for other reasons.