Frankly, it seems "dumb". Foursquare suggests friends to me that it thinks it has connected via Facebook and Twitter (which I opted into it doing). The suggestions are easy to ignore and dismiss. It seems obvious to me. I guess this just feels like a cheap slimy way to be connections in the social graph, but I think in the process of doing so, they devalue the value of connections that people put effort into establishing.

If I were following all of my Facebook friends on Twitter, then it would just be Facebook. Do you really want to rush to build the next generic, mass-appeal social network where the content is low quality drivel?