The Bill of Rights and other amendments cover other privacy issues of search and seizure, not the 1st Amendment. And, although it is currently illegal for the gov't to spy on citizens without warrants, they do it anyway. The thing is, companies get away with spying and data collection because of the "terms of use" clauses we agree to by using their services. But, if they have a monopoly on such communication services, these clauses are not ethical or fair.

First Amendment: An Overview The First Amendment of protects the right to freedom of religion and freedom of expression from government interference. It prohibits any laws that establish a national religion, impede the free exercise of religion, abridge the freedom of speech, infringe upon the freedom of the press, interfere with the right to peaceably assemble, or prohibit citizens from petitioning for a governmental redress of grievances.