Rated 2 out of 5 stars

I am using Firefox 3.xx. But this did NOT work.

This worked:
Install Firefox and the AdBlock Plus add-on
Add Filter:
||facebook.*$domain=~facebook.com|~127.0.0.1

Source: http://blog.thoughtpick.com/2010/07/how-to-disable-facebooks-social-plug-in.html

I Googled for:
Facebook social plugins disable