Ideally we shouldn't have links to sites that are selling products or services.
In practice I look for links that are in direct or indirect competition with this forum. "Direct" would a link to a competing parenting forum. "Indirect" would be like a blog link that promotes other parenting forums (or has links to parenting forums).
Obvious since I have signatures turned off (it's a guy thing sorry
) its not something I'm watching closely. I've kind of left that monitoring to you and Fallon because its your thing. Overall, I'll support what you think is right.
In the case of Shari her posts seem OK, but I have not read more than a handful.