Thing 21: Tags

Tags work along the same lines as wikis in that you are relying on crowds as a source of information. As a resource, Flickr is subject to those same limitations. If you are looking at a photo of a butterfly, you can never be sure whether it's correctly identified. I would be even more wary of Flickr in this regard than of Wikipedia, since you are talking about people who are more into photos than writing or reading.

As far as using Flickr as a photohosting site goes, I'd rather use Photobucket and paste in the html.

I have nothing against online communities, but I find the idea of using photos as the basis for one a bit odd.