title: How to resolve error: "The post’s action links must be valid URLs"
body: <p>Using the latest version of ShareKit to post URLs like so:</p>
  
  <pre><code>[SHKFacebook shareURL:[NSURL URLWithString:@"http://www.google.com"]];
  </code></pre>
  
  <p>is resulting in the following error message being displayed (in a web view):</p>
  
  <pre><code>Application response error
  The post’s action links must be valid URLs. You can see this because you are one of the developers of the app.
  </code></pre>
  
  <p>What does this error message really mean, and (more importantly) how can it be fixed?</p>