Using Robots:
http://www.inmotionhosting.com/...rawling-your-website

Using Google Webmaster tool:
http://www.inmotionhosting.com/...arch-webmaster-tools


Google Link: https://www.google.com/webmasters/tools/removals

but these are not guides to delete it from social networks?

Giuseppe, can you clarify:

1. You want your site to appear in google search results?
2. You don't want your site to appear in google search results?

1. I want it to appear !

You need to add your site in google index by

www.google.com/addurl

and then after ur site is approved you will see your site in google search

Following these guidelines will help Google find, index, and rank your site : http://support.google.com/...=en&answer=35769

Please note that google, as any other search engine, "sees" your site as a "guest". So if you site is invisible to guest users, then google will not be able to index it.

thanks ! :)