Are you confused whether a group or a page is better for your Facebook viral marketing strategy?
We were too.
I think groups are suited for multi-way communication and get unwieldy beyond a certain size. Groups work better in the short term with smaller sets.
I think a page is better suited for a business for the long term … and something that Facebook will build more in the future for enabling marketing activities. I suspect they view groups as a more personal/community feature and not a marketing channel for businesses. A page can scale to MNs of members (remember Obama’s page in Facebook)
I found an excellent article on this topic that pretty much said everything there was to say. Click4Details