Is your organisation restricting your access to social networking sites?

On behalf of one of my colleagues who cannot access this site:

"We are undertaking some research into the use of Social Networking sites as an integral need for museums within local government. We have been put in a tricky position by the introduction of a superfilter on the IT network which bans access to basically all social networking sites. In an effort to put together a business case to present to our Executive Managerial Team I am looking for examples from other local government authorities on how they use social networking to promote their sites/museums, for professional development and for social and professional networking opportunities.

If you have any policies relating to social networking I would also be interested to have copies or to know how this is being rolled out in other LGAs.

I would also be interested to learn if other LGAs are experiencing similar difficulties in explaining the need for social networking access for their museum/library/collection? Perhaps our case is not so dissimilar to other? I would love to raise a discussion on this topic on nexus or the museum wiki but unfortunately....the computer says NO!!!"