Shaun,
With the 3.2 release, we'll have some options for setting the tags per article. I like the idea of using the introtext as a default though, so we'll look into that. For now, there's not much we can recommend for setting those values (easily). The 3.2 release should be out within the next 2 weeks though. When that's out, any Likes that have been created will automatically be updated with the new tags, so it will be retroactive.
Hope that helps, and sorry for the confusion. The 3.2 release is very focused on the 'social' aspects of Facebook, and this is one of those areas.
Thanks!