YouTube is one of Google's most server-side test prone apps. Every couple of weeks, sometimes even days, we spot a new layout somewhere that brings a little change to the table. The latest is a renamed 4th bottom tab to Activity.

Activity merges the previous Shared 4th tab (which has been official for all since August) with your Notifications (which until now are hidden under Library -> your profile picture -> Notifications). So there are now 2 top tabs under the 4th bottom tab, yay! The move does make sense though since you can see all your active YouTube shared video discussions with friends as well as catch up on all the recent uploads, live broadcasts, and activity from the channels you follow.

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