Why won't 'Promote' link appear on posts on a particular facebook page?

Question

I have one page at http://facebook.com/trelloapp that when I use Facebook as the Trello user, it shows a 'Promote' link on all my posts.

But when I switch to use Facebook as Fog Creek Software and go to the Fog Creek page at http://facebook.com/fogcreeksoftware, none of the posts show up with a 'Promote' link.

My account is a 'Manager' on both pages.

Answer 1

The Fog Creek Software Page has 285 likes; only Pages with over 400 likes are eligible to see the Promote button.