Re: "Social Web"

You might want to take a look at this:
http://wiki.blojsom.com/wiki/display/blojsom/Social+Bookmark+Buttons

I've played with this in the past, I think you need just a little tweaking (not very sure, but they might be 2.x compatible, so you have to do some tweaks for 3.x).

About your second problem, I'm not very sure what you want, but you can take a look at this to see how you can create static pages like "about" and others:

http://wiki.blojsom.com/wiki/display/blojsom/Page+Filter

Ofcourse, I think you have to provide the full backend code for collecting the emails. The comments logic could come in handy here...