Our denomination recently published a short article on social networking. It's addressed to ministry leaders, but I think the content will prove helpful to anyone. Love it or hate it, we relate and communicate via status updates, tweets and blog posts. As believers, we must determine whether these technologies can be used redemptively.
I intend to ruminate on that subject shortly, so stay tuned.
In the meantime, check out Jacques Elllul's 76 questions by which to determine the merits of a given technology.