Facebook open graph meta tags maximum content length

Question

Does anyone know the maximum valid length for each of Facebook\'s open graph meta tags?

The description of the meta tags on http://ogp.me/ does not list maximum length

Answer 1

In my testing:

og:title 40 chars

og:description has 2 max lengths:
When the link is used in a Post, it's 300 chars. When a link is used in a Comment, it's 110 chars.

So you can either treat it as 110, or, write your Descriptions to 300 but make sure the first 110 is the critical part and still makes sense when it gets cut off.