In case anybody had any doubts in the past, we feel it is now pretty safe to historically name YouTube as the next big multimedia content revolution. Sure, "online video" might be a more technically correct and inclusive, but let's be real, with over a billion hours of content consumed per day, YouTube in the undisputed king. That being the case, Google's multimedia arm can't afford to take its sights off the future even for a moment. So, it only comes natural that things like annotations - an old remnant, dating back to 2008, well before the HTML5 revolution, eventually get axed. Well,...
Source: http://www.gsmarena.com/google_is_pulling_the_plug_on_youtube_annotations_on_may_2-news-24049.php