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Can I use the same API key on multiple blogs?
Just like with Akismet, you're welcome to use the same API key on multiple blogs. In fact our interface is optimized for quickly switching between stats for multiple blogs.
Does Akismet work for WordPress MU
The Akismet plugin works out of the box with MU, you can let users enter their API key and you have no problems.
If you hard-code an API key for all your blogs the system will flag you and unless you already had permission from me you'll be permanently blocked.