The 1680 figure seems to be wildly inaccurate,
ceruleagos posted this in her journal:
* Total accounts: 45301
* ... active in some way: 10604
* ... that have ever updated: 14097
* ... updating in last 30 days: 3003
* ... updating in last 7 days: 2154
* ... updating in past 24 hours: 709
I know he is working on the servers, and he's already upped the friends limit once and may do so again, but I don't know the specifics of what he's done so far and is still planning. I'm trying to see if I can scrape up the money for another perm account to help out with finances.