correcting FB meta tags [duplicate]

Possible Duplicate:

How does Facebook Sharer select Images?

Facebook share url thumbnail problem

I discovered, after testing, that I had the wrong meta tags for image or url. After correcting the information on my webpage, FB still seems to reflect the old information. Is there something I can do to correct this? Or doe开发者_运维知识库s FB just take a certain length of time to kick in and if so, how long?

Changing the tags should be enough, but there are some tags that aren't allowed to change past certain limits (check here: https://developers.facebook.com/docs/opengraph/ under "Editing Meta Tags"). You can use the linter tool to check that your tags are correct, or see, if they are wrong - why they are wrong:

https://developers.facebook.com/tools/debug