I've noticed that the "share" links on answers and comments note that they not only include the answer ID, but the user's ID as well:


Why does Stack Exchange do this? Obviously, it is tracking it, but for what purpose? Does this affect the user?

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    +1 for totally confusing me by your screenshot. :D – yo' Mar 9 '17 at 23:48

They include your id so you can earn the Announcer, Booster and Publicist badges:


as far as I know that's the only use of the user id in the link.

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You get a badge for it. Who doesn't like incentives?

The three badges are Announcer (bronze), Booster (silver), and Publicist (gold).

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