There should certainly be some kind of privacy we can rely on, but millions of photographs of people in crowds can now be identified by computer while we are shopping or on vacation.  There's no guarantee of  anonymity when millions of faces are daily posted on the Web.

Yes, they can. Facial recognition.

More jobs for LEO's with binoculars, eh?

You would think they would have more to do than spy on people.

I hope they don't waste time for that; many crimes are committed with only hints who they are looking for, possibly even someone who's otherwise wanted,and surveillance of an area in which a suspect is known to frequent, the places he goes, and the hours he is known to keep, could result in catching a suspect or even a cooperative witness who can point out a perpetrator.

If it works to stop crime, it’s useful.

Just recall that privacy and human rights can be sacrificed to do that -- and when a case comes to trial, even result in dismissal of charges.

Hello everyone! I find this drone thing rather dubious.

In what way?  The use of them or you don’t believe people are using them at all?