It's probably ordered by the number of chats each person made
TOP - 10
@AEG Bot - 459
@Jotaku - 385
@BAYONETTAGEAR3 - 165
@Dvoramla - 106
@Someguy2733 - 15
@Luckai - 11
@Laffey wanting Siren observer - 5
@Scoobert2000 - 5
@"" - 4
@Wintercat - 3