Some ways to build traffic to blog sites and gather links online meant for SEO involves buy blog reviews. This is a debated subject because many do not feel it is right to pay for blog reviews on products that have not even been used by the reviewer. Sometimes, this can actually hurt your credibility with people that read your blog and know more about the products than the "paid" blog reviewer.
Because websites need to gather links to rank higher on the search engines, many believe that buying blog reviews has gotten out of hand when you consider there must be 100 other ways you can gather links online, whether it means purchasing them or just posting your information and content to let people link to you on their own.
There are ways to build links properly, when done right, using clean techniques. You don't have to pay to get reviews, but can post informational content about products comparing them to information on other products, for example.Some information on products is purely factual, based on the claims or ingredients of the product, so they are simply stating facts in comparison of facts, and not offering a subjective personal opinion. These paid blogs that are purely technical in nature may be considered ethical.
You should go with posts that are genuine and ones that the bloggers have taken the time to research or use the product to make an honest assessment that is useful. Also, reviews from relevant blogs that are already established help make it known that the blogger already knows the market well, as they should.