Umm, @TeamYouTube, why am I subbed to this channel? Pretty sure I didn't click the subscribe button...pic.twitter.com/YNhsgWOE21
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Yes, I saw it on my subfeed, but I didn't have any 3rd party extension.
That's strange. Does it show as *Subscribed* on the channel page? Do you see this happening across devices? Also, can you try signing out and signing in to see if it's otherwise? Keep us posted.
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