Does my organisation need an online community?

It seems as if anyone with an email these days is on Facebook, or as one of our journalists cleverly and correctly renamed it Faasbook, but how do we know when to open online communities for our organisations?

Here is a link to short article to get us thinking.

http://www.openforum.com/idea-hub/topics/technology/article/what-is-a-community-manager-and-should-i-hire-one-ben-parr

How do we know who makes a good community manager? See ideas at the link below.

http://mashable.com/2009/04/06/community-manager/

Regards,

Mod