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Yes, through AutoSteem you can follow anyone. Try it out and see if you are happy with results - but I think you will find there is a lag before your vote is registered, because he has a decent trail already (see point #2 in my previous reply). But it doesn't hurt to experiment with these things and see what result you get.

So the trick is really to find someone on the top 20 list who hasn't got a big following?

To maximise your returns - yes :)