title: Facebook API Error 100 'link' is invalid
body: <p>I have my site qa.carryon.com (this is our test site). I have configured it for facebook login and send invitations. In facebook I have configured SiteURL as '<a href="http://login.qa.carryon.com/gs/" rel="nofollow">http://login.qa.carryon.com/gs/</a>'. 'login.qa.carryon.com' is our CNAME and we are using Gigya as social third party.</p>
  
  <p>Login is working fine and when users see the list of facebook friends, user will click on one of them and the facebook send dialog triggers. The link parameter for send dialog is something like this '<a href="http://qa.carryon.com/loyalty/signup?userid=xghdt6ys&amp;username=xyz" rel="nofollow">http://qa.carryon.com/loyalty/signup?userid=xghdt6ys&amp;username=xyz</a>'.</p>
  
  <p>For this link am i getting the error code 100 link invalid or there is other issue in configuration. I am doing this for first time and i cant understand whats going on. Please help i am stuck with no clue.</p>