Joule is a nifty little friends-tracking tool that shows you who added you to their "friends list" (really a watch list for many, yours truly included) or removed you from it since the last time it was run. I use it each time my friends count has evidently changed, and it tells me whom to welcome or, less often, bid farewell.
The creator of the tool says that the ISP is down, so it's offline for the time being. Any idea if the author is amenable to having it hosted somewhere?
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Banazir