There are certain things that can anger you to the point of not needing to wait for a 'cooling off' period.
When I saw two RPIs on a train sitting with their feet on the seats, and praising the murder of Keith Blakelock (this was just after the riots), then later stating that they better go and do their job, I took a photo of one of them (couldn't get the other without being seen) and Tweeted FCC immediately.
Was it wrong to do that? Did I mask the face of the woman that had her feet on the seat? No, as I didn't have the means to do that from my phone. But, given you could see what she was doing, I couldn't easily be accused of making it up.
Would I have made the same complaint without Twitter, or a cameraphone, having to rely on my word against theirs? Probably not.
I have no idea how FCC dealt with things. I doubt they could do anything about what they were talking about (definitely no proof of that) but it doesn't set a very good example to sit with your shoes on the seat in full uniform! The man, who wasn't photographed, was probably fine as even the CCTV on the train wouldn't be able to see the seats at the end of the carriage.