Web 2.0 footprint question?

What type of things should you avoid when creating 5-10 web 2'0's and using them consistently?

Do you need to be vary of:
-Proxies
-Using the same computer (VPS needed?)
-Other similar things

Truly feel like Google can spot such simple things and i'm trying to plan how forcefully I have to execute web 2.0's.

You need different IP and hosting for domain version. But I can't sure for subdomain version.

Create new mail id with different user name for each web 2.0 creation.
For each creation use different proxies or VPS
Create some social media pages for web 2.0 sites.