UPDATE - April 3, 2014: this issue is resolved and the Photo Upload feature is once again working. Thank you for your patience!
Facebook recently contacted us to let us know that the Photo Upload feature of SL Share is not permitted to automatically include location SLURLs in posts made from the application. We’re working with them to get a hotfix out ASAP, but in the meantime the Photo Upload feature in SL Share will not work, as Facebook has temporarily disabled that part of the application. SL Share’s Status Update and Check-In features will continue to work.
When SL Share’s full functionality is restored, SLURLs will no longer be included when you share a picture using Photo Upload, but you will still be able to let your Facebook friends know where to join you in Second Life by using the Check-In feature.
We apologize for the inconvenience this may cause you and are working to get a fix out ASAP. We’ll use this blog to keep everyone posted with any updates and will of course let you know once the issue is resolved as well. Thank you for your patience.