The amount of time, bandwidth, and threat mitigation waste this piece of crap has brought to the DoD is obscene. If you're not a PAO, you don't need to be Facebooking/Tweeting/Whatever at work.
A great deal of funds are spent on redundant activities, even within the same division of an agency. Various offices could each have separate twitter feeds to keep others updated on their activities and efforts. The use of social media would also unify agencies and enhance collaboration.