Spamming sites still worked pre-hummingbird and infact it works even better now.
Even Negative SEO works just as well. Have a competitor you don't like? Give him 100k blog comments with "Buy Viagra" and suddenly he will be de indexed in 3 months or less.
I think half the reason she quit is that SEO is so damn unpredictable now. You can make a spammy site and might rank or might get de-indexed. But at the same time you can make a 100% whitehat site and it probably won't even rank and can get just as easily de-indexed as a blackhat spam site.
You need to read up on BlackHatWorld a bit more Mr Cutts.
P.S. I enjoyed reading about that Twitter stuff from 2-3 years ago.
It didn't matter what I said in my reconsideration request to explain I had no knowledge or control over it (I've no interest in spammy link sharing or buying links), I kept getting similar canned responses.
I gave up in the end.
casamundo.de + .nl - auto generating texts and internal, irrelevant links. Outranks every player.
independer.nl/autoverzekering/merken/opel.aspx - generating doorway pages with minimal / none added value
veiligonlinegeldlenen.nl - just check their back link profile and site, and you know enough
meinestadt.de/berlin/ - great start, until you find stuff they really rank on:
meinestadt.de/berlin/dsl - no value add
And many, many more. The German market is competitive but with smart spamming and automated content generation, you can outrank anyone.
Always come up, they offer little value, and are often no more than a few months old, and all made for adsense pages of content ripped from other places. Moment you take one down like you did with hdwallpaperarena.com they just redirected it to hdwallpapersinn.com (which even has the same logo up still).
I just found it a bit of an an odd one given some tactics they apply are outlawed yet they seem to get by, I always see these sites crop up.