As a tax payer, I would prefer my tax dollars are used as efficiently as possible - so if the alternative is to hire human police officers to manually search twitter and create reports then I would oppose that in favor of automated technology. I don't think the technology is the debate here, it simply enables us as humans to be more efficient. The decision to surveil is the debate here, and I can see it both ways. Do I think the police should be aware of a large gathering (regardless of purpose) in their cities? Yes, I think that's prudent for a variety of public safety reasons. Do I want this done in a way that does not interfere with protests or have a chilling effect? Yes, absolutely.
As a society we are only starting to become aware of the implications. "Fair game" is the biggest misnomer - it is anything but.
The Government contends that the Harlan standard shows that no search occurred here, since Jones had no “reasonable expectation of privacy” in the area of the Jeep accessed by Government agents (its underbody) and in the locations of the Jeep on the public roads, which were visible to all. But we need not address the Government’s contentions, because Jones’s Fourth Amendment rights do not rise or fall with the Katz formulation. At bottom, we must “assur[e] preservation of that degree of privacy against government that existed when the Fourth Amendment was adopted.”