I have a blog site example.com
(WordPress) and have 10,000 (Alexa 30,000) visitors daily. We've decided to start a forum under example.com/forum/
(vBulletin)
Is this a wise idea for SEO? Should I upload a site map of the forum or I should let Google find the forum on its own?
What are the SEO implications of this method? Should I use a separate domain for the forum?