FriendCaster is considered end-of-life and was removed from Play back in February.
Recent changes Facebook have made to their service appear to have rendered the app inoperable. Since the app is discontinued, we do not plan any further updates at this time.
The latest Facebook API that was published in April made some new restrictions to what actions the app could perform, this was a significant enough change that it was decided to discontinue the app vs. re-engineering a less complete offering that would be less competitive in the market.
Thank you for using FriendCaster. We appreciate all of our customers usage of the app over the years.