Here we go again. Any bash at IT who apparently block people from Social Media. Whilst I can only speak for people in my organisation, we don't sit there thinking up this to block. If Social Media is blocked at your organisation then that is a problem caused by the culture and rules and regs of that organisation.. Not because us IT people are wicked.
Peter - by IT I meant "senior managers who set the IT policy" as you're quite right, it's those who make the rules and regulations (or are failing to change the culture) who are responsible, not those at the sharp end setting the configuration options.
My session this morning at Councillor Camp (well done to the team organising it – excellent job!) was about how councillors can prod their councils into getting digital.

[...] Pack from MHP Communications was next with 10 questions to ask to see if your council gets digital, covering things like should council’s be collecting [...]
[...] 10 questions to see if your council gets digital (or any other corporate) [...]