Google's PageRank worked well until people realized what drove search & how to optimize for it. But the web moves much faster than the colleges do. A million spam pages are created every hour! Thus Google's relevancy algorithms have grown in complexity over the years.
The search wars have officially arrived! Google's ongoing quest to make its search results more impervious to spammers has become an infographic, which basically is a badge of honor for any tech bitchmeme.
"People trade links off topic in large reciprocal link farms." -> "Google filters out sites that have a high ratio of reciprocal links." And so on and so forth…
"Every change is a new opportunity! Some webmasters are already building business models around the exploiting of opportunities created by the latest algorithm change."