After announcing the beta version of Inbox and My Contacts about two weeks ago, YouTube has just announced that the features are now live for all members. There are also some changes to the Inbox based on your recommendations. "Now mini-thumbnails appear on the list of messages for video responses and videos users have shared with you. Also, the link to view all comments has been restored in email notifications for comments made to your videos and responses to comments of your own"(The YouTube Blog).
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