Website Dev't for Menschies Worldwide--DB, social media integration, track and display data

We would like to hire and consult with a development team or very experienced developer on a website for out nonprofit. We hand out items with ID numbers and would like to track the location of these items and display them on a widget--Google map and maybe a list with some meta data such as user, location, and desc of how the item traveled there. We need UI flat design dev't. The nonprofit is a public benefit charity intended to spread goodness by random acts of kindness through volunteerism. We need a way to integrate social media to allow users to create accounts and track their good deeds. Report widgets showing good deeds will not show other users' names. We are not sure how to set this up and are willing adjust price based on conplexity and scalability. We imagine the user base will be very small initially but may grow to support 100k users in the future. Experience with database dev't is needed. The UI design would incorporate best of the net techniques and style, borrowing from Flat 2.0 designs. Please, let us know if you need more information.