I don't know why but recently I've been seeing pc players online (you can tell because they have a silver account) but it shows the xbox logo. Wth? Wondering if anyone knows about this. I've asked a few people I saw like that and they were indeed on pc and have no idea why it shows xbox.
The pc logo is not shown in the recent players list but you can see it when you select a player in the list, assuming the player didn't set their status to offline.
@ultimatechipsx - I usually just assumed that Microsoft was doing one of their specials where they allow silver accounts to play live games for a day or whatever. Can you be signed in to both xbox and pc at the same time? If so, maybe that's how they're doing it. I'm not sure.