Matt Cutts said this:
That tweet was a joke about the sales pitch on the black h@t forum where the links were being sold (no footprint sales copy equals fail). That's enough proof that forums get monitored.
So, it looks like Google is hanging out on the forums which makes this forum just as susceptible to being targeted by Google snooping around & pumping info. from other forum members. I don't have a problem trying to help other forum members but this is a bit of an eye opener & maybe I sometimes talk too much about what I do with my sites, IDK. I won't be sharing as much about how I SEO & believe me, that's not easy for me to do, I like to talk SEO.
Anyways, I guess my point is be careful what you say & who you talk to, more important keep your own domains/links to yourself. That's always been my motto, never show your money (links/sites/niche), you have to look out for yourself.
Well, your on your own & you can pretty much bet there's someone from Google that will eventually look at the link package your selling. Don't think just because your small fry & selling links that Google won't be snooping around your sales page or even your link profile, looks like they target the big sellers & filter down to the smaller sellers.
If your buying links from these public link sellers your sites stand a very good chance of getting slapped in Google SERPs. Head on over to the black h@t forum & look at the thread that searchengineland links to, have a look at all the folks that got unnatural link notices in WMT (Web Master Tools). Don't set yourself up to fail buying easy to flush out link packages. If Google can find the sales page that's selling links, they can also find the links (footprints).
Another thing for SEO buyers, just because your not buying links from these types of public link networks doesn't mean your SEO guy isn't buying these junk link packages, odds are most low budget SEO sellers are outsourcing their link building to cheap link sellers/packages.
I'm not trying to scare anyone, just pointing out you might want to pay attention to what's going on.