I don't know where you live, but if you lived in Chicagoland the advice for how to engage on this would be easy: there are 1-4 (depending on your muni) Facebook groups where all the meaningful policy discussion happens. Hold your nose and log into Facebook and look.

> Why would Craigslist stop Flock-related posts from going through? The only answer I can think of is something along the lines of a National Security Letter.

That's because you lack imagination. 99 percent chance they are blocking you because they don't want "divisive political rhetoric" on the platform. Allowing a surveillance state is "apolitical" as long as it doesn't involve rocking any boats or making any noise.

... and NSLs don't do that. It would really be nice if people actually understood what NSLs were before blaming everything on them. Trust me, they are bad enough without inventing stuff.