[amelius]

Well, of course it should allow my friends to search my blogs . Just not the rest of the world.

But I guess that if Blogger would be "open", so that other search engines could also index those blogs, then this whole scenario would not work (malignant search engines could expose everything to everybody). So my suspicion is that it would actually be quite hard (or at least require more research) to make an "open" version of facebook.