No others plugin that may causes the error : I deactivated all plugins and try again :
30 errors on Firebug :
- FB.getLoginStatus() called before calling FB.init() (as before)
- Unsafe JavaScript attempt to access frame with URL
- The frame requesting access set 'document.domain' to 'facebook.com', but the frame being accessed did not. Both must set 'document.domain' to the same value to allow access.
- The frame requesting access has a protocol of 'https', the frame being accessed has a protocol of 'http'. Protocols must match.
- s-static.ak.fbcdn.net/rsrc.php/v2/y_/r/zu4Lu4t233O.js:34 (got that line at the end of the report, don't know what it refers to)
I also try the debugger facebook tool, that's what i got :
Open Graph Warnings That Should Be Fixed
Inferred Property : The 'og:url' property should be explicitly provided, even if a value can be inferred from other tags.
Inferred Property : The 'og:title' property should be explicitly provided, even if a value can be inferred from other tags.
Inferred Property : The 'og:description' property should be explicitly provided, even if a value can be inferred from other tags.
Inferred Property : The 'og:image' property should be explicitly provided, even if a value can be inferred from other tags.
Small og:image : All the images referenced by og:image should be at least 200px in both dimensions. Please check all the images with tag og:image in the given url and ensure that it meets the recommended specification.
What should I do now ? Something with Open Graph I suppose ?
Thanks you for your help :)