This report "Tweeting for Teachers" says social media should be part of teacher PD. as much as I agree with that, if you just unblock social media, it doesn't mean teachers WILL use it for PD. Teach them how. Plus, expect pushback from teachers who don't want to mix personal and business. Although Facebook won't allow 2 profiles for a person, Twitter will and some teachers may want to take that route.
This very well written piece from Cathy Davidson has me cheering. It is written in response to the recent NY time article "Grading the Digital school." Cathy is the one who belongs in the New York Times in my opinion. Right on. Please read even if you don't agree, it will get you seeing how many educators think.