+1

E-mail is incredibly underutilized as a technology.

One could make an argument the majority of instagram's (of course not the filters) functionality could be handled by e-mail, but the "perceived need" to use apps on the smartphone that you purchased for a large percentage of your monthly income but the experience of using the app is difficult to discount.

Another point worth considering is that much of the functionality associated with Path is available in Facebook if you want to play around with settings, but for some reason Path still seems relevant.