No, you may not use your tribe to advertise in any way, shape or form since it will negatively affect the Snapzu community as a whole. No one wants to browse tribes that are full of spammy links to other sites.
If we notice that your tribe is being misused in any way your tribe may be removed from the Blog Enhancement Suite, and/or you may lose your Blogger status. It is important to keep in mind that tribes are public inter-connected communities with site-wide equality, etiquette, and rules, and not someone's personal playground.
The only exception is that we allow you to link to your related blog, website, or social media profile on the side in the rules and etiquette area. You can only link to a site that also links back to your tribe and/or has the widget embedded.