Regarding tweets that warn of speed traps, any HONEST government would welcome them. Why? Because they get the traffic to slow down. And that is what you want in the first place.

Did you ever watch the traffic when someone has been pulled over for speeding? The traffic thinks, now the officer is busy. And they speed up, zooming right past the officer high-speed. Tweet warnings do a lot more to keep the traffic speed down than do arresting officers.