First thing i ever played online was yahoo poker. but as for real games, q3 then UT2003 and RTCW. I still play q3 occasionaly 10+ years later, can't beat a good humiliation..
 
I'm not sure if anyone knows what I'm talking about, but does anyone remember CokeMusic?
It looks like this was like an online chat room game.
There was a big trading scene too, like those coke couches were like another form of currency in that game.

Anyway, that was the first online game I can remember playing.
That was one of the most fun games back then. I remember playing musical chairs or something in people's rooms to win those couches. God that game was fun.
 
Competitive Pokemon battling on Pokemon Online (it was still called Shoddy Battle when I first started)
 
Tfc. Played it first day it came out. Back when you had to type super fast if you wanted to talk shit mid battle and live. There was no voice chat yet. Had to build a bunch of keybinds if you wanted fast team communication.
 
My first online game was Star Wars: Battlefront II.

And to this day, Mos Eisley is known as Blade's Town.
Haha, nice man. I fucking love the Battlefront series. So fun and undermined. I wish they would make a SWBF3 already instead of shitty lego and force unleashed games.
 
First I did ToonTown Online, was such a boss in that, that by the time I was done playing I was solo'ing the bosses :3

Now I do MineCraft, TF2 and occasional chess.
 
My first on steam was : Call of Duty Black Ops
My first one was ............. i think it was Minecraft XD