Probably talk about Clinton's upcoming impeachment, the US is gonna bomb Yugoslavia, then spit some facts about what lies to not believe in the future.
Comradeship // Freechat
Talk about whatever, respecting the rules established by Lemmygrad. Failing to comply with the rules will grant you a few warnings, insisting on breaking them will grant you a beautiful shiny banwall.
A community for comrades to chat and talk about whatever doesn't fit other communities
You'd have to start sending written essays to a local newspaper predicting stuff you know its coming, eventually gaining enough attention that you get invited to a radio show or something.
Maybe write some short fiction about the boring dystopia we live in, imagine "in the future, everyone will have access to a library worth of information with a device that fits on their pockey, however, the vast majority will use this all powerful device to watch people having sex".
1997 was the year I first discovered the internet. My schoolfriend's family got it. We would go onto online chat rooms and meet people (who, looking back, I'm pretty sure were paedophiles). So you could definitely post on the internet in 1997 and there seemed to be quite a few people online.
BBS and IRC; also FTP.
Kind of impossible because logically, if you send information to the past you end up changing that timeline and thus none of the "predictions" carry weight. That's assuming that time isn't deterministic which is something that's fundamentally impossible to prove.