The end of an era! WE WILL MISS YOU ANNOTATIONS! https://support.google.com/youtube/answer/7342737 …pic.twitter.com/vOur6MEnH2
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
I most commonly watch YouTube via a queue on Chromecast. I see neither the description nor pinned comments, unless I'm specifically looking for something. Definitely agree, not a good place for corrections. (Not that I see annotations or links in the corner either)
Amusingly, I *can* see end cards, though, obviously, I can't click on them. Definitely do add links to videos you reference in the description, else I can't find them.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.