I have an account but not the right kind of phone. I think if you are high tech, it is a good way to keep them looking, but as a purely computer based communicator, my Facebook page seems to spark plenty of the right kind of networking. I am amazed at who I "friended" and can keep up more at my own convenience.
Twitter (to me) is pretty immediate and used extensively by people who are very into impulse, not deliberation. If you want everyone to know what you are doing WHEN you are doing it, it is perfect. But.... that means a lot of wading through a lot of stuff that should still be in their head.
Facebook is like your own forum that you can boot people out of and invite people in. A great place to see and be seen, with a bit more interaction, over mere pronouncement.
Join Twitter and lurk for a while. See what you think of it, it costs nothing.
dj*
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