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This has a number of benefits:
- Most of the time the contact sync reply will be empty
- We can do contact sync more frequently (It's 5 mins now, was 30)
- Figuring out what contacts were added or removed is much simpler and
less likely to get things wrong.
- Non-friends are no longer accidentally removed because there's no need
to compare contact lists
- On accounts with lots of friends this gets rid of one source of CPU
usage spikes
- Less load for facebook's servers (lol)
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