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Factom, Inc. has been maintaining a 50% efficiency on two of the Authority nodes it is running. It is running at 100% efficiency on the 3rd node which is there to create more Fed servers than Audit servers.
Factom inc is not running an Authority node in the community testnet, but is running several follower nodes on the community testnet for debugging purposes. It is hard to get an accurate count, as they are turned on and off on local machines and to test specific bugs. It is likely between 5 and 10 nodes. There are many other non-"community testnet" testing nodes that are used to test and debug factomd. This is also hard to get an accurate count, because the number fluctuates regularly, but is above 10.
Here are the detailed updates covering the month of September.
And the Grant updates for convenience: