[a1a]

>>If so, I'm expecting the same reaction in the future about google analytics.

1) Google analytics is a service for tracking your visitors behavior.

2) Facebook like button is a like button.

You would be surprised if the "like button" silently tracked your visitors behavior -- just as you would be surprised if the "analytics script" silently liked googles own facebook page.

>>From the other hand, {facebook,google,random company} did not force someone to put the appropriate {buttons,code} in their site.

They are not getting sued for forcing someone. They are getting sued for adding unwanted/unadvertised functionality that undermines the right to privacy into their service.