some of them - there already were a couple of testnets for different purposes ( SAFE Network Client Testing Commences Dev Update & 2nd Test Network Release :safe: 8th March 2016 Stable Droplet Test Network Join the NEW Community Test Network (Running Now): "community1" ) and since [quote=“Viv, post:165, topic:9829”]
Don’t think we’re too far off from network size 3000 already 
it seems like this network already has at a minimum 1800+ nodes right now
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I’d say it is a huge success