Early adopters
blog.wepay.com
blog.wepay.com
Of the people who have the problem that WePay solves, there is a continuum of how bad the problem is, how important it is to them to fix it and so on. But there is also a continuum of those people's attitudes towards change. Psychologically, some people like change and some don't. It is these early adopter that you want - that are a subset of the people with the problem who are suffering acutely.
Crossing the Chasm is well worth reading. It's also cool that the research was originally done about seed potatoes.
http://www.istrategylabs.com/2009/01/2009-facebook-demograph...
40% of facebook users are 18--24.
now compare to people with iphones in 2009 (different to people who queued, admittedly, got stats on this? but still earlyish adopters since 2009 data)
http://gorumors.com/crunchies/age-demographics-of-iphone-use...
whilst for the iphone, very few are in the 18--24 range: just 13%. most people are 35-54.
it seems from this 2009 users of the iphone tend to be older than users of facebook. perhaps because the iphone is an expensive device.