Are there any online worlds like World of Warcraft?
Any other MMORPGs would be your best bet. For a few examples, Final Fantasy XI, Age of Conan, Everquest, etc.
Battlenet is the official online component of Blizzard Entertainment for World of Warcraft, Warcraft II: Battlenet edition and Warcraft III, Diablo and Diablo 2, Starcraft and Starcraft 2. It allows chat and cross-game friends list. Note: Battlenet is required for most of the newer online Blizzard games like World of Warcraft (not new, but required) and Starcraft 2.
ANY place that buys or sells World of Warcraft accounts is not legit. Buying and selling World of Warcraft accounts is against the AuP and ToS that everyone agrees to when they install, patch or upgrade the game. There is no site on the internet that can legitimately sell a World of Warcraft account.
Are there any online xbox 360 role play games like world of warcraft must be an online multiplayer please?
Fate is a single player game that can be played on the PC meaning no internet or online capabilities needed to play the game it is concidered a RPG (Role Playing Game). World of Warcraft is a MMORPG (Massivily Multiplayer Online Role Playing Game). The basics are the same but in WOW you meet other gamers in the game and you have to be online to play it plus pay a monthly fee.