It is not acceptable for members of the site to post links to sites for the sole purpose of promoting the site and/or driving traffic to them. This includes promotion of one's own sites/pages or those they are affiliated with. This has generally been viewed as standard etiquette between websites and website communities. Such behavior is viewed as being similar to spamming a website.
It is acceptable to post a link to another website or page on a related topic/post to provide relevant information. The page/site should be to directly address the question/issue/concern/etc. being posted about here.
It is allowed to have a link to one's site for self-promotion in one's own post signature. For more information/restrictions on BeardedDragon.org's policy on this, see the Banner Ad Signatures policy.