Google invest many millions in research and even more on quality people to take care of this ever evolving animal, that is Google.
I here many marketers moaning and groaning every time they make a search change, but more often than not, it’s because they were trying to game the search engines 🙁 I must admit, I have done it all, mass website creation, scraping, spinning, mass commenting, mass linking, you name it, i.ve done it! But as Google get smarter the black hat side of marketing becomes more and more obselete.
I still see individuals and companies advertising SEO work, they say they’ll give you 10,000 backlinks within 24 hours! Well, good luck with that, because that will do nothing but harm to your website.