You can bet that everything sent across the Internet is stored somewhere. But read? Yeah right. People don't seems to realize that there are 6B+ people online and just how big a number 6B is. If you have a staff of 30-40K people (like the FBI or NSA) and they spend 40 hours/week doing nothing but reading Internet posts and the average person spends 4 hours/week writing Internet posts (likely a huge underestimate) and the FBI agent can read 5x as fast as the person can post, then the collective manual surveillance capacity is about 2M people. That gives a 1 in 3000 chance that a random Internet user would be surveilled (though it is decidedly not random). With more realistic numbers of maybe 5000 analysts reviewing potential threats, spending 10 hours/week on it (so they have time to actually follow up on threats, attend meetings, communicate with their boss & coworkers, etc.), and the average person spending more like 25 hours/week posting on the Internet, that's a surveillance capacity of 10K people and your chances are more like 1 in 600K.