what do ? & _rdr mean
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What Does ?, &, or _RDR Mean in a URL?

There are lots of times that you may see the string _rdr in a Facebook URL. Often it follows either a ? (question mark) or an & (ampersand), such as in https://www.theinternetpatrol.com/brick-wall/ or http://www.facebook.com/gettingstarted/?step=friend_suggestions&_rdr. But what do they mean? Read on.