When I add friends on LinkedIn and sync again, it adds every single LinkedIn Friends onto Dex. This will make Dex's storage cost a lot. Implemented correctly, it should keep track of LinkedIn friends, even if I change names, then ignore the ones that I already have, only add ones Dex doesn't have. That's P0. P1 would be to update linked friends that are already on Dex. P2 would be continuously keep it updated all the time by running server-side.