Social media has officially reached the mainstream, with more and more internet users joining social networks and offering their two cents on product reviews. But for brand advertisers, blogs are proving to be the king of all social media.

According to a new study by JupiterResearch, blogs have more impact on purchase decisions than social networks.

The study found that 25 percent of blog readers say they trust ads on a site, compared to just 19 percent who felt the same way for social networks. Of those blog readers, nearly half are checking multiple blogs whenever they go online, and 40 percent have taken action as a result of viewing an ad on a blog. That number jumps to 50 percent for consumers who are considered frequent blog readers.

One reason blogs have more impact is the way in which a blogger can act as an authority on a subject and build a relationship with the reader.

"One of the things that's so great about them is the personal, specific information," said Valerie Combs, VP of corporate communications at BuzzLogic, which sponsored the study.