Feedstats.info essentially provides the same information that previously was available to all FriendFeed users, but not just for your own account - opening up the ability to analyze anybody's activity, so long as you know their user name.
Entering the ID into Feedstats.info
The data says I use Google Reader, Twitter and FriendFeed most often.
If you enter a FriendFeed user's ID into Feedstats.info, you can see how often they post per day (in the last 1,000 items), what services contributed to that feed (both in bar chart and pie chart form). You can see what days and what times of day the user most frequently uses FriendFeed, and also, who provides the most likes and comments on their items.
FeedStats Shows I Use FriendFeed Least On Weekends, and from 1 to 7 a.m.
FeedStats Also Shows Who Has Activity On My Items
Using this service, you can see which users log in to FriendFeed at specific intervals during the day, and those who are pretty much on the service around the clock, stopping only to sleep (I assume). You can also, if you check enough accounts, get a good idea as to who the most prolific people are in terms of "liking" activity, especially if they lead many different accounts.
FeedStats Takes A Look at Rochelle
Hutch Carpenter Under the Microscope
As with most stat sites, it's easy to start playing with the charts, and equally as easy to ask, "what's the point?" At what point does knowing the data is there start to impact user behavior? Should Rob Diana stop sharing so frequently on Google Reader if he finds out that it's nearly 90 percent of his feed? Should I be using Twitter more or FriendFeed less? Or the other way around?
Rob Diana: Google Reader Expert
Jesse Stay Uses Google Reader, Twitter and FriendFeed.
One of the assumed corollaries offered by Feedstats.info is a guess that those who like your items have a high compatibility with you, making them most "like" you. But what I found is that there is a small subset of users with a tremendous number of likes and comments, far outstripping mine, and they may lead my account as well as others, making our correlation a false one. But other than that, it's still an interesting set of data to play with. You can sign in with your FriendFeed API key, and can check any account, as I have.