Social Jackie
[...] turns out that the 24 hour limit was never implemented. Instead, each link was available for an unlimited number of time for an unlimited number of clicks [...]
Umm, actually, the shared reward links between me and my buddy have had a time limit. (We only have each other as neighbours, so I don't know about any maximum number of clicks.) It wasn't 24 hours; I don't remember exactly, but I think it was somewhere around 30ish hours, no more than 36 hours.
Or are you talking about the shared goodies you guys give out? I've come across ones before that said "share reward exprired limit", too. *confused*