the importance of this news depends on how you monetize your sites.
if you run ecommerce/transactional site(s), it's almost irrelevant. when was the last time your analytics showed a sale coming from Facebook or Twitter?
if you run content site(s) and make money off of ad impressions or ad clicks, Facebook is a great way to drive traffic and get more ad impressions. the quality of your traffic also doesn't matter as much as it does for transactional sites.