For the US posters. Here is a rundown of what this bill allows.
Hijacking searches
Selling your location and personal information to marketers
Inserting ads
Installing apps on your phone that track you
Undetectable tracking code
Every Digital righnts group in the US is up in arms about this. Including the EFF. This is a serious breach of privacy. You should contact your representives and tell them how you feel about this.