Star Wars Galaxies was one. City of Heroes was another. And while Tiny Speck's Glitch was only around for a fraction of those titles' long-lived lifespans, it nonetheless made an impression.
Don't believe me? Check out artist Cami Avellar's contribution to the one-year anniversary of Glitch's demise. It's a poster featuring over 250 Glitch avatars, and it took over three weeks and 100 hours to make!