No one wants to talk seriously online to total strangers. Where's the value add? These people aren't part of your social network and with the relative anonymity of posting online, they won't be. Back in the Fido days, we'd actually know the other posters in our net and might meet up with them on a regular basis. Where's the tie-in here? It's no wonder that it's all trolling, all the time.
Only a special environment composed exclusively of people from a real life community of interest could possibly overcome this.