It would seem that Tagged doesn't feel they should have to reinvent the wheel, so to speak, when they can just copy it.
While it seems all the social networks are looking at launching their own application platforms, they are all going different directions with them, which could make porting the existing apps difficult. Tagged has taken this to mind and wants to just copy Facebook's exactly so developers can bring their applications over with little to no work.
This is a good idea for the app developers as they will get twice the bang for their buck, but somehow you know Facebook isn't thrilled by it. This will give Tagged a huge leg up as they will be able to start with a huge base of apps where Facebook had to wait for everything to be developed. It will also give them a quicker path to getting started while LinkedIn and Hi5 are still developing their own.