I must say, I thought of the big companies like Apple (and even Google) when I heard "transparency". Like the transparent iPhone pre-launches? People might like transparency, but when you look at the numbers, Apple seems to be doing nicely "behind closed doors"...

There is a time for security, too, and personally I'd prefer if all the folks at the bank weren't downloading Facebook widgets or visiting potentially malicious short URLs from Twitter...

Should sales and marketing teams be using these means - yes, I think so - but not all employees during work hours on their work systems.