Share Web 2.0

Trying to determine whether my company blog should be housed on corp. website or using different platform like Blogspot? The goal is to drive as much qualified traffic to the “new” corp. website as possible. Also, what would be better from an SEO perspective?

I’m thinking about reactivating my facebook page because i’m hearing it’s more and more used in business and profession worlds. And it’s great for keeping in touch with old contacts. But, i’m worried about the time cost vs benefit. What or the pros and cons to having a facebook page or anything similar to facebook.