Okay, thanks.
One would assume that the intent of such subpoenas was to investigate possible breaches of defamation law or track down cyber stalkers et al, not 'harass and intimidate' people with an opinion. Oh well, I suppose if we all got a dollar every time laws were used for purposes other than what was intended, we'd be too rich to hang around here.
That said, publically criticising a current employer has always been an extreme sport, whether the criticism is expressed at the pub or online.
Was the subpoena in relation to DG&P content, or another sub forum? Did anything nasty come of it?