What do you think about bolding keywords in your website? How google reacts to this? Maybe it seems like spam to Google?
It doesn't help you at all. In the old days it did, but not anymore. Write naturally for people. Avoid bolding keywords and use heading tags for your headings.
Hope my 2 cents will help. Try to visit the link for big G http://googlewebmastercentral.blogspot.com/2009/09/google-does-not-use-keywords-meta-tag.html
Unlikely, Google doesn't look for those factors anymore. Even PageRank is less important than it used to nowadays.
Google did not give importance to bolding keywords in search engines ranking.....So avoid the bolding keywords in SEO prospective.....
Use every possible tactic available to you... "White Hat" only of course... Variety plays a major role in how well you rank..