In terms of advice that's true for me too, I used to be very open about myself and personal information but I'm very much less so now, however other than that, I wouldn't generally say anything on here I wouldn't say to someone's face.
I would absolutely never speak negatively about someone behind their back since, obviously, they'd recognise my voice...I would wait until they had left my presence.
Mamy- yes thank you! In the end I showed my friend the broken leg and he picked it up and just snapped it back in!! So it is possible to push back in if you have very strong hands!