Yobot is a bot account in English Wikipedia handled by User:Magioladitis. Yobot is not a bot account in simple wikipedia. The few contributions here were done indirectly through copied edit histories. Similar indrect contributions can be found in many Wikipedia contributions. Yobot has contributed with more than 1 million edits in English Wikipedia making it one of the most productive bots so far. Yobot uses AutoWikiBroswer (AWB) for it edits and Magioladitis is one of AWB's developers.
For more information on Yobot's contributions and tasks check en:User:Yobot.
Any feedback on the style preferences of each project is welcome since AWB developers are always available on comments and bug reports.