San Francisco's 311 service is now using the internet real-time. Is there a Noe Valley pothole you're tired of? Broken sprinkler in Dolores Park? Want a new freeway through the City? "Customer Service Representatives are available 24 hours a day, 7 days a week, 365 days a year to assist you. 311 can help with: street cleaning graffiti removal, pothole and sidewalk defects, abandoned vehicles, city garbage can maintenance, department information ... and much more!" After you submit a request "You will receive a Direct Message from 311 with either your Service Request number, the answer to your question, or a request for more information from us." Posting to @SF311 isn't the best way to get an answer, however: "For faster service, please us a DM as only DM's are monitored real time."
Response time seems to be quick, and the requests are all over the map. If nothing else, it's fascinating to read what people in San Francisco are concerned about.
[SFGov: 311 Twitter FAQ]