I agree on blogging. Note the internet is the world largest (social) network, so start using that to your advantage. In addtion to blogging I have these proposals:
- Sign up with facebook if you are not already a member and join with people with similar interests. There may be more than you are aware of. Use other social networks too, if you find that important.
- Start a Google Group Google Groups
- Make your own social media network / forum / community.
- Virtual reality. Make your own like Second Life or similar.
- Resources:
Cybertoolbar.com: A collection of popular resources related to the cyberspace.
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