[dannyr]

Yeah it's cached by Facebook. That's why if you want to change your meta and/or open graph tags info, you need to feed your page to Facebook's Url Linter (https://developers.facebook.com/tools/lint/).

[mpeg]

you can also programmatically force it to refresh the cache via a POST to https://graph.facebook.com/?id=http://google.com&scrape=...