I don't know if anyone else follows these stories, but I read the other week that the state of Missouri has passed a law that makes it illegal for teachers to have any private communication on social networking sites.
The article peaked my interest because despite being seriously hidden, my stalker (which I say endearingly) students find me on Facebook and friend request me all the time. I've struggled with how to respond to their requests. On one hand, I love that they want to be connected with me even though I'm not their teacher anymore. On the other hand, I don't want to look unprofessional. To date, they are all sitting in Facebook Purgatory because even though I haven't accepted them, I can't bring myself to deny them either. It feels like I'm sending a message that I don't care about them outside of my classroom, and that just isn't true.
[Yes, there are creeper teachers out there, but they are obviously not the norm. And you don't make a law like this to prevent a very small minority of people from doing something that's usually harmless.]
At the end of the day, I think it should be a teacher's right to friend whomever they want on Facebook or Twitter. I'm annoyed that state governments have the audacity to dictate whether or not I can communicate with my students.