Perhaps most of you have seen comments consisting of nothing much more than a post snippet between the text "[...]". This looks to be automated comment spam solely created, though, to produce some sort of "link back" (not to be confused with a real "linkback").
Can anyone enlighten me on this? Does anyone not know what I mean -- and therefore shall I elaborate?
P.S. Google does not allow for search non-alphanumeric searches, so Google is useless for tracking this down. And even wordpress.org's search function is useless, actually giving false positives as it finds '[' characters.