>And where are we drawing the line here? Answering most of your questions: Causing controversy. Just faffing about on social media, even negatively, generally

>And where are we drawing the line here? Answering most of your questions: Causing controversy. Just faffing about on social media, even negatively, generally won't be a problem until such time as you portray your employer in a bad light (say, by shouting at their customers apropos of nothing) and cause them a PR issue.