Many of my IT counterparts in my company and other organizations are the reason the company blocks many social networking sites. There are times when they behave like overzealous centurions and advise higher-ups to block these sites. Fortunately, some senior management types at work have requested to unblock the more popular sites.

I have found some organizations blocking cloud sites. I get messages from users at these places because they cannot access a file from my site (linked to a cloud service). Their IT geeks will unblock long enough for them to download the document then block it again. I think they confuse the cloud with bit torrents. Or maybe they're just control freaks.