Covert spam? 1) Spammer uses a bot to post harmless automated comments 2) Waits for a while, than looks which of his comments ranks higher in Google 3) Edits

Covert spam? 1) Spammer uses a bot to post harmless automated comments 2) Waits for a while, than looks which of his comments ranks higher in Google 3) Edits some of top-ranked comments to include usual viagra ads with hyperlinks to promoted websites