Facebook is dropping support for application tabs on user profiles. Starting from Wednesday this week, users will not be able to add the APRS tab using the aprs.fi APRS application to their FB profile, or publish any other application data in their public profiles. For details, please see the Facebook developers blog.
If you think this is stupid and wrong (like I do), please complain to Facebook. If you are a Facebook user and still wish to try out the APRS FB application and haven't done that before, please do so before Wednesday.
Sorry for the late notice, but I didn't expect them to actually remove it. They promised 4 months of lead time, but now they're pulling the plug after only 1.5 months.
If you ever consider developing a Facebook application, please remember that Facebook can pull the plug for you at any time they wish. It's a gamble, and you can certainly loose the time you've invested in developing a Facebook application.
There is plenty of discussion and complaints about the matter on the FB developers forum
Additionally, if you have any smart ideas on what the APRS application could do (instead of publishing your APRS position to your Facebook friends using your profile tab), please let me know.