Silicon Valley has created a model for identifying and nurturing high-potential young companies. The Pioneer fund hopes to do much the same thing for high-potential people. The group, announced Thursday, plans to use the internet-era tools of global communication and crowdsourcing to solicit and help select promising candidates in a variety of fields, along with evaluations by experts. Its goal is to put more science and less happenstance into the process of talent discovery — and reach more people, wherever they are in the world.