In 2007, Google announced a marketing campaign from paid one-way links that transfer PageRank.[29] On June fifteen, 2009, Google disclosed that they had taken measures to mitigate the consequences of PageRank sculpting by use of the nofollow attribute on one-way links. Matt Cutts, a well-known computer software engineer at Google, http://search-engine-optimisatio40516.blog5.net/23101450/a-simple-key-for-search-engine-optimisation-unveiled