Well it's been almost 1 year since GTA Online launched. The online community has changed quite a bit since those early days (both good and bad). What are some of the things (non-mod related like Billionaire give-a-ways) that we used to see that simply aren't around anymore or you rarely see and miss.
For me, one of the things is the BMX bikers at the ramp in downtown. Always took the time to stop and watch the random players doing their tricks. Unfortunately there was always some azzhat who knew they were an easy target and would shoot the bikers up. I haven't seen anyone doing tricks in a public lobby in months. I guess they do invite-only now.
Another thing is doing team missions in a public lobby. I remember the first few days of GTA Online where I thought it was super-fun to play team missions and race all over the map to capture some drugs or whatever against another group of players. No one does these anymore.
What else is gone, but not forgotten . . . . ??