Very interesting thought on Fred Wilson's blog.... about 'networks of networks'. I have thought about this quite a bit recently. But Fred sums it up nicely with an interesting example:

But a funny thing happened. I had about 450 members yesterday morning. I now have 510 members. I haven't added 60 members in a single day since the day I put the reader roll on my blog.

One of two things is happening. My post on MyBlogLog yesterday got more people to sign up (certainly a part of it) or the people joining at Techcrunch and elsewhere in the past day are also joining my community.

If the latter is a significant part of why this happened, then it points to the fact that networks of networks are a powerful community building tool.

This is a significant thought.... perhaps it is a meme in and of itself?