youtube
My friend has a "Play Next" button in YouTube which can be used to queue videos on YouTube without making a separate playlist. I also found an answer on Quora stating that the person has it. It looks something like this:
My friend has no separate widgets/extensions installed in his browser. I tried looking for, but couldn't find any documentation for the feature.
How can I enable this feature?
Looks like someone just linked to your http://www.youtube.com/watch?v=something URLs from Twitter posts. You're not telling anything about the Twitter accounts; they could be fake as well. The 'attack' can have happened through real tweets or through the Twitter API.
Could be almost anything:
Somebody made a mistake linking to the wrong video?
Someone is testing ways to hack Youtube counts?
Someone created a viral tweet "Click here for M Cyrus n*k*d pics"?
Very likely it is not an attack directed at you, you are just 'anyone' as far as the attackers are concerbned. You may feel singled out, but you were not. There could be more people affected.
I would not worry too much if it stays with these attempts. Well, you have to get your account unblocked of course, that's a nuisance.
The Auto Play toggle is saved between different visits, maybe it wasn't that way at the time you asked the question, but now it does.
I switched to another video, tried closing the tab/browser - the setting is still kept.
Iridium among other things, disables the auto-play of YouTube - which also apply to the watch later playlist.
The player will switch to the next video in the watch later list, but won't auto-play it.
Best Answer
Press the same three dots in the image you have next to the video but here is what pops up...
(Add to queue, Save to Watch later, Save to playlist, Not interested, and Report)
What you need to press is "Add to queue" and it is like play next