The U.S. created the internet, we can damn well use it how we want without the interjections from the peanut gallery.

Also, Mexico is the largest source of LEGAL and ILLEGAL immigrants in the U.S. So no, we don't try to "keep them out" we just try to keep their whole country from coming over. Maybe if we focused on making Mexico a better country with NAFTA so many of them wouldn't be trying to get over here.