Mymagicview the correct term we believe is Panda updates. Google has been doing these updates since shortly after I started writing. For hub pages it has been good and bad. At the moment most of the hubs which are under optimized are doing well. We have not asked for back links from anyone and depend on others sharing the hubs.
The most important thing you can do is have you keywords in your summary. Don't try to optimize keywords you want every sentence to make sense to the reader. What we do can be found in one of our hubs. Search, search engine optimization to find it. This is one of our subjects and part of what we do as a corporation. The article was updated after the last Panda update.