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

Here's a good link regarding this topic: http://www.joshspeters.com/how-to-optimize-the-ogdescription-tag-for-search-and-social

Regarding Facebook it says:

"Right now Facebook only displays the first 300 characters of a description so if your primary audience is on Facebook write your OG:Description tag accordingly."