Crossposting is the act of posting verbatim copies of one message on multiple message centers, without customising each copy to suit the audience or forum.
The practice likely originated on Usenet newsgroups where individuals seeking replies, an answer to a technical question perhaps, would post the query to related newsgroups.
Presently, the crossposting can mean posting verbatim text to a number of blogs, message boards, whatever slashdot is, or the message a number of mailing lists.
Crossposting is a technique used in Astroturfing to generate the appearance of wide-spread support.
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