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Bravenet.com provides do-follow links to blog or not?
I think yes!
Bravenet.com is only for Bravenet's own business. As you have posted in the Sitebuilder forum I assume that you mean Bravesites.com.
For free accounts Sitebuilder defaults to to nofollow except for internal navigation in the site. There is no option to change this.
I don't know if there is a way to change this in a paid account.