Cooler heads and wiser minds than mine, please consider.
I came across a Question that struck me as chatty and not suitable for StackExchange, much less Math.SE. The initial response was simply to vote-to-close, but I noticed that the Question seemed centered on a link to an external site that had materials that were relevant, and in fact made it difficult to see what Real Question might have been in the OP's thinking.
Subsequently I looked at other Questions posed by the same User, quickly finding a half-dozen that were a similar pattern: rather shallow, even vague problems that mention a page with related material at the same external site.
The dirty part of my mind thinks this could be a ploy to steer traffic to that ad-supported site. No relationship between the User (who is fairly recent here, and Unregistered) and the external site is specifically disclosed in the posts I saw. The User's account here indicates 13 years of age.
If it were a clearly commercial promotion, I'd have no qualms about flagging it as spam. Note the advice in this Meta.SE post suggests avoiding even the appearance of self-interested links.
Here's my Question:
Is there a way to search Math.SE for links to this external site by other "users"? I'm imagining Google Analytics or something similar allows for such a search. Searching for the site's domain name turns up three or four unrelated posts, which only suggests that it's a site that's been around awhile and has some legitimate fans. Searching for the embedded URL links would tell me whether Math.SE is being gamed with a series of accounts/posts to drive traffic from here to there.