Trending Videos is a new unwanted
Facebook addition to your News Feed. Since the Trending Videos is grayed out, you can't directly block any Trending Video application. Instead, the easy way to remove these news stream entries is by individually hiding all the source applications such as Socialcam. If Trending Videos has no source app videos to select from, then you've stopped Trending Videos from appearing in your stream. Here's how to block the source apps:
Move your mouse cursor to the upper right corner of the linked video and click on the X that appears
(note that the Trending
Videos article is shaded gray)
Select "Hide all by Socialcam"
You'll receive a confirmation that Socialcam posts will be blocked from your News Feed
Here is another example blocking Yidio trending articles:
