Virgin mobile is offering users of Virgin Mobile USA the chance to earn free cell minutes by listening to and responding to ads.

I believe we’re going to see this a lot more – things like tell-us and freeconferencecall.com already do this – but it’s just a matter of time before this becomes a viable alternative to buying/renting/paying, especially in places/industries where there’s a limited budget – i.e., kids/teens.

Of course, it all depends on how the reaction to the ads are – never before has TARGETING been so important.