Dan 2 on Nostr: When someone shares a #YouTube video link, what is that extra, completely unneeded ...

When someone shares a #YouTube video link, what is that extra, completely unneeded part that looks like:

si=XXXXXXXXXXXXX

Is that a “share identifier”?

Is Google using that to identify who originally shared the video, and who you are associated with based on who is else is clicking it?

#privacy #asknostr