Many of you probably already know this, but there are some active UX groups within LinkedIn. We watch these groups, and from time to time we see some interesting posts, which we try to pass on in our blog.
The most active UX groups I have seen on LinkedIn are:
User Experience Professionals Association
Interaction Design Association
If you’re interested and a LinkedIn member, you can join any of these groups (though in the case of the Interaction Design Association, a moderator has to approve your membership).