You could encourage normal people who are using the app (via early-access or whatever) to 'review' it by a twitter, facebook or other social media campaign. Sure these things sound cheesy and old hat even to me now, but they can work. 'Tweet about us to get a free upgrade to Premium'/'free 500MB disk space'/whatever incentive you can provide once users have already got the app.
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You could encourage normal people who are using the app (via early-access or whatever) to 'review' it by a twitter, facebook or other social media campaign. Sure these things sound cheesy and old hat even to me now, but they can work. 'Tweet about us to get a free upgrade to Premium'/'free 500MB disk space'/whatever incentive you can provide once users have already got the app.