This is what showed up when I placed one of the recent article links in.
Critical Errors That Must Be Fixed
Could Not Follow Redirect URL requested a HTTP redirect, but it could not be followed.
Warning
Errors That Must Be Fixed
Missing Required Property The ‘og:type’ property is required, but not present.
Notice
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.
