I had the exact opposite reaction: "This is Twitter, but without all the interesting bits from people I don't follow." A lot of the benefit of watching Twitter when I have a game on is having funny or informative stuff wander my way. Facebook is more insular than I like, and frankly I'm not close enough to the people I like watching sports "with" on Twitter to have them on Facebook.

yea following sports games is one of the biggest use cases for twitter and something they are the best at.

I'm interested to see how well this works. Seems like most of the good analysts currently post on twitter instead of facebook so that could be a limitation... but if they get a bigger audience on facebook now, that could drive them to change.