Um, no. If I want to share a link to a specific page, there's no reason to assume that I want to share any of the query string that is not actually required for

Um, no. If I want to share a link to a specific page, there's no reason to assume that I want to share any of the query string that is not actually required for somebody else to see the same page (like all of the tracky goodness that seems to be ubiquitous on the web these days) -- and for the same reason, there's no good reason for you to assume that I want to click on a "share" thingy on your page. And while breadcrumbs may aid me in navigation on my visit, the "how did I get here?" stuff has absolutely zero value to anyone who arrived at the page using a deep link. Oh, and if you make any of that compulsory, you won't get a link; your information just became valueless.