One quibble, though, is that entering "r=" or "/r=" (with or without quotes) into a Google site-search or the forum's native search just returns results for "R" and that, of course, is totally useless. At least it does so for me.
It really does not matter. OP was explaining the referral link spamming things. In a URL, it could be anything depending on the developer of the site. However, most of the time we see like this: r= or ref= etc.Truth is, the variable can be anything even your or mine username like : mdayonliner= or MagicSmoker=
