I'm active on LinkedIn, but so far I haven't been compelled to tweet or follow twitter streams when sitting at the computer. Some of the online discussion groups I participate in include the eLearning Guild, ISD Now, Creative Designers and Writers, Multimedia and E-Learning Professionals,  Instructional Systems Design Professional, and Instructional Design and E-Learning Professionals Group. I also like to create art or designs for e-learning. And then there's my whole life away from the computer, which involves tennis, bicycle commuting, skiing, and gardening. It's best to have a healthy balance in where my energy is directed!