Google Alerts, my man. Excellent for putting out fires, btw.
I imagine a surge of users from news.yc set off a few flags considering their product is intended to monitor this sort of thing.
He replied 2 hours after... Not so quickly.
Pretty fast if you're being mentioned all over the web and you're not already a HN user (he just signed up for that comment), AND neither the story linked to or the title on HN said anything about Tynt or what they do.