Raleigh, NC, uses SeeClickFix, supposedly.
One road issue I entered (with a picture) was just ignored until it aged out of the system. They're doing a city wide resurfacing program to address multiple road issues, but it would have been nice to get that response instead of Jack Squat.
I put another request in for tree servicing (as required by law) and nothing happened on it for three months. I finally called the city directly and the issue was taken care of within two days. Again, it would have been nice to be told "hey you need to call so-and-so" instead of having to hunt that down myself, since (I think) they advertised this application as the way to submit issues to them.
Someone has to be monitoring these apps or they are just useless to the citizens. They are, however, useful for a limited time to the City Council since people can vent into the void (the app), but that only works until people realize the app requests are ignored.