Re: What about Twitter and it's ilk
I remember being on an expats forum around 2000, which was basically-english speaking foreigners living in Belgium worrying about how many hundred visits to the town hall it would take to get our ID cards. Oh and the Americans complaining about how they had to fill in forms for both US and Belgian tax authorities - something which makes astrophysics look like doing your times-tables in comparison.
And even amongst the hundred or so regular posters we had a few angry sweary argumentative sods. Oh and one stalker who found out people's (read women's) addresses and sent unwanted flowers and gifts, as well as other even less savoury stalking behaviour. I was impressed that the local police actually bothered to deal with that.
Usenet in the mid-90s wasn't exactly always friendly either, which was my first go at the internet.
I was also a forum-Mod on Hattrick (an online football management game) in about 2004 - and we saw the odd death threat then, but lots of bad behaviour and a bit of organised bullying too. For some reason the Scottish forums were the worst for that, and the game owners despaired of getting the Irish to stop swearing. Though this is only because they deemed "feck" a swearword. Pub kicking-out time was the worst on the forums, but even though we had decent moderation it didn't keep everyone in line - and as many users were paying a few quid a year to play it wasn't even anonymous.
I'd say the internet is the same, because people are the same. There's just more of it nowadays.