Not sure either - I think should we be honored 'billgates' has taken the time out of his duties at Microsoft to define what we do for a living in a thread about antibiotic use? :p:p
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There has been a huge increase in the amount of ad-spam lately..... grrrr. All these old threads, dredged up with a new post that has little to nothing to do with the original concept or question.
Frustrating.
I have "reported" a few that were blatantly spam.
But other than that, I don't know.... I think a tip off is when there are a bunch of links at the bottom of the post. Other than a daycare website, I mean. Or when, the post just doesn't "make sense" to the actual conversation.