Facebook blocking content or marking link as spam, the URL you supplied is invalid
Unfortunately, if enough people mark a post as spam or block a post from their News Feed, and that post contains a link like the one you've sent, Facebook will block third-party applications from sending posts containing that link or anything similar. In order to work around this limitation, post the message to Facebook directly since Sprout will no longer be able to send the message once the restriction is imposed. You can also try unshortening the link in the Compose box in Sprout Social.
For more on Facebook's reasoning, please note that this is the same rationale behind the error message #368 that we receive from Facebook: the action attempted has been deemed abusive or is otherwise disallowed.