No dilemma here at all... The internet is blocked, with exceptions granted based on business necessity. I don't see that changing at all.
What I do see changing is what we regard business necessity. I would like to make better use of social networking sites, for example, to promote internal projects or to provide opportunties for more casual collaboration. I could also use it as a platform for employees to view the stuff I make on my own time, like this:
http://www.xtranormal.com/watch/6781353
(Apologies in advance to my banking friends here.)
Hey, it was my first shot. I'll refine it this week, and incorporate it in our orientation for levity. The point is, none of my employees can view that at work.
And that's wrong. Just plain wrong.