"Traded by", "Wanted by", "Trade in", "Trade out" - what's difference?

Traded by

Shows users trading this item (who marked it for trade in his/her inventory)

Wanted by

Show users who is looking for this item (who added it to his/her wishlist)

Trade in

Allowed only for authorized users. Same as Traded by but filters users and shows only those with whom you can trade (who is trading this item and looking for items you are trading).

Trade out

Allowed only for authorized users. Same as Wanted by but filters users and shows only those with whom you can trade (who is looking for this item and trading items you are looking for).

Conclusion: the main difference between these sets of buttons is that "Trade in/out" additionally applies a filter of your inventory/wishlist to leave only those traders that can find something interesting in your profile for a successful trade.