In most folksonomies, we find ourselves stymied by minor divergences in tag names. The set of "scifi" and "sf" and "sci-fi" probably fits together (cf. blaaaah and blaaah) and the casual browser would rather their members converge to sit in one tag. But spam tags benefit from divergence. Ah, what we learn when QA takes a vacation.
If you don't take Man-Agra, you'll have the subject of today's other great spam:
manxiety