It's a pejorative term coined by Lord Foulkes and adopted by the unionist media; I would view anyone who was an online campaigner who countered the mainstream unionist establishment position, as contributing greatly to the debate. The cowards in the mainstream media and their unionist bedfellows would see them differently of course.
If you are referring to online abuse during the referendum campaign, the post-referendum period saw a poll which indicated that 11% on no supporters had experienced online abuse and 20% of YES supporters had encountered online abuse - this will, of course, all be lies in your head.