Are Blogs Influential?

How influential are blogs in helping the reader make a purchasing decision? Here is the percent of American bloggers who accepted to have been influenced to perform the following actions because of blogs they read:

Decide on product or service : 21%
Refine choices : 19%
Get support and answers : 19%
Discover product and services : 17%
Assure : 14%
Inspire a purchase : 13%
Execute a purchase : 7%