See the two comments below for an example. The first comment has the title of the linked question in the tooltip, but the second link does not.
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The tooltip is simply created from the URL. The short link being as short as possible, there's currently not enough information to create the
See the comments below in action, which use:
That aside: I really don't see why folks would use the short links on these sites themselves. I actually think many don't know that these are referral links (which are only useful when used on third-party sites) and accidentally use those rather than the long links...