The CIA:
Whilst many have got a bit hot under the collar about this, I can't help but question - What's the point? We are not likely to see tweets saying - "Well done to our boys in (insert name of developing nation) for a good result last night." And, if we a see a toot along the lines of - "It wasn't us - honest", It's not going to carry a lot of weight.
The CIA needs a twitter account like a fish needs a bicycle.