Are organisations rushing into Facebook?

Short answer: Yes.

The costs outweigh the benefits. Most organisations want to jump on the bandwagon and look "hip".

What costs you say? Isn't Facebook free?

Let me list some of them

1. manpower needed to cross-post items and manage comments
   
2. content on the Facebook can't be backed up
   
3. no comment moderation options available
4. content cannot be restricted to paying customers/members