As I said on Twitter, this is probably a good move for ESRI and building a community around the User Conference. Facebook is a closed ecosystem (you have to sign up to participate) but given Facebook’s traction online, it is the right move. So if you want to keep up on the ESRI UC news, sign up for Facebook and join the Official ESRI UC group.

**Update: **As some have pointed out on Twitter, not every company allows access to Facebook so the community might be missing key people.