When shopping for SEO services, be careful you are not buying links designed to help boost your search engine ranking. Google penalizes websites caught doing this. In fact, a marketing firm hired by Google for promoting their Chrome web browser engaged in this behavior, and the Google Webspam team took action by lowering the Chrome website's Page Rank, seriously reducing its ranking for many common search terms. Basically, Google even penalized itself for breaking its own rules.

Read More: Google’s Chrome Page No Longer Ranks For “Browser” After Sponsored Post Penalty