Keywords don't stack
 

Keywords don't stack, don't let your web page at a glance is everywhere. Many webmaster friends very want to improve keyword density and emphasized, so will deliberately in the website of each key position put on to do keywords, some back to overstriking. Make look optimization of the trace heavy, user experience is very poor. Keyword density is really very important, but not at the expense of the user experience for the price. And keyword density too much to the search engine is not friendly, but can cause negative results.