If you write a Blog reviews, according to the FTC rules and regulations, you have to disclose if you are being compensated by a manufacturer, advertiser, or service provider when you review an item.
Example: If a blogger gets a laptop from a manufacturer to review and gets to keep it, he or she will have to make that fact public.
If you got a product for free you must disclose this information.
Anyone who is directly compensated to write about a product by an advertiser is covered by the new FTC rules.
Before I leave the topic of blog reviews, I would like to recommend that you really consider doing video reviews of the products you are reviewing and add them to your review site.
Video plain and simply converts.