The main domain or to a subdomain of the main domain.You can have one wordpress.com blog mapped to the main domain and as many others as you want...
There are a few ways to spider.The first, which I'll call general spidering,simply grabs a page, and searches it for whatever you're looking for...
Admin CP -> vBulletin Options -> Message Attachment Options -> Limit Space Taken Up By Attachments (Total)Otherwise I have seen problems like this...
Separate names with a comma.