Web 2.0 Footprints and Usage

Hi all, I've got a couple of questions about web 2.0's.

1/ I was wondering how careful you need to be when building web 2.0's? I've read in a couple of places that you should only setup 5 web 2.0's per email. Is this correct? Does your IP address play a factor as well? I'm trying to build as natural as possible with no footprints.

2/ Secondly I have built a link wheel of 1 tier of web 2.0's with the intention of ranking a page in my site higher so have all the web 2.0s in the wheel aiming…

Web 2.0 Footprints and Usage