4chan (main boards /vr/, /vg/, /v/, /tv/)
8chan (just this board and sometimes a brief excursion to /tv/)
Then other shit like news, movie and video game websites. Yootoob too.
just a way to kill time really. no recommendations sorry OP.
my favourite online community ever was this 'Random Writings' board on Roadrunner Records website. I was a regular there from 2001 to around 2007 when they finally shut it down. It was fucking hilarious. Basically it was supposed to be a website for kids that liked bands like Slipknot etc but all these elitist metal kids had taken it over. For a while there was zero moderation and you could make a troll account in two seconds since you didn't even need email registration. The result was thousands of colourful trolls with names like PooPooPlaytime and FunWithFeces. It was fucking hilarious and totally unmoderated for a long time. It had its own unique humour, similar to how imageboard communities tend to have their own unique humour. Eventually they closed it down because the management realised we'd be there forever.
If that place existed I'd still be there today without doubt. By the end the regulars there were all friends since we had posted there for so long. I miss that place so fucking much.
4chon was my second favourite online community after that. I miss that a lot, too.