First we need to build a bridge between "offline" diaspora with todays digital world. We do this by combining traditional offline campaigns, with digital elements (such as register and/or donate online, share with friends etc).
Next we introduce a reward scheme. A donation now triggers a payback, f.ex. in the form of digital water vouchers that can be handed to family and friends back in Somalia . We show that digital promises (vouchers) give real-life benefits (water).
Finally we introduce schemes where diaspora can invest (into a fund or directly into projects) on a crowdlending model - and receive direct payback on their investments. We have now achieved the digital diaspora.