Same here - I had someone tweet who the murderer was in a programme I was recording - I mean why?! I don't mind people talking about programmes but that was just ... argh! I've noticed James Moran go into a rant about people doing things like that - esp after the last ep of Being Human S3 - he pointed out that they shouldn't assume everyone watches programmes at time of broadcast & asked that people please just show some common sense. I know how much it irritates me so that is why I try very hard not to do it & I'll switch to DMs if someone really wants to talk about it - I'm not saying it isn't hard not to spoil but it's not impossible!
I'm going to stop there because I'm getting a bit ranty