[Repost] Clean YouTube links. When you get a link from YT, it includes an ID tracking back to YOU. It's a "query string" on the end of the URL like this:
...?si=[tracker_ID_here]

This ID allows YouTube (and their owner, Google, and *their* owner, Alphabet, and ALL of their associates) to track the people who click on the link, and the apps they used, back to you, building a network of none-of-their-business.

Good news: DELETE the "?si=..." part & the link works just fine without the tracking.