Listening to Last.fm radio is a good way to find new stuff/expand your number of artists (if you for some reason care about a generated number on last.fm) if you trust last.fm's recommendations and radio connections. However, getting more artists in your library should be paced, just because you'll need time to soak up new things. Plus, it's a lot more fun to talk to people with say, 200 artists who actually know something about those artists and their music.
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