Yes, Discovery Educators have made themselves know on Web 2.0 tools.   After all, call them social networking tools, so certainly the Discovery Educator Network folks ought to be using, connecting, and learning on these tools.   A few web 2.0 places to find DEN and the Texas DEN are:

http://twitter.com/TXDENLC   http://twitter.com/DEN

On FaceBook:
Name: Discovery Educator Network
Category: Organizations – Academic Organizations

http://discoveryeducation.ning.com/

http://www.flickr.com/groups/den

http://www.shelfari.com/groups/24939/about

http://groups.diigo.com/groups/discovery-educator-network

http://den.wikispaces.com/   http://texasden.wikispaces.com/

So, come on!  Explore the World (Wide Web 2.0)!