Can someone with a greater knowledge of Internet mechanics than I have (which means almost everybody) explain what benefit spammers get from posting generic comments on sites like ours? I understand the adverts-pretending-to-be-comments (like the recent Fidget Spinner posting). I understand a generic comment followed by an unconnected ad ("Your site is most enlightening. Great buys on trampolines at..."). But what's the point in vague, mostly ungrammatical, platitudes posted without a link? Does a successful post somehow open a back door to be used for nefarious purposes? Or what?