mining by building network of people? I don't know...

The idea might be innovative, but I will now install unknown app on my phone, because of privacy concerns.  You know this Pi app build by an unknown SocialChain, there is no way I would trust this seller. Especially because android app requires so much permissions.

Permissions:
read your contacts
read phone status and identity
read the contents of your USB storage
modify or delete the contents of your USB storage
read the contents of your USB storage
modify or delete the contents of your USB storage
read phone status and identity
receive data from Internet
view network connections
full network access
run at startup
control vibration
prevent device from sleeping
view network connections
full network access
run at startup
draw over other apps
control vibration
prevent device from sleeping
full network access
draw over other apps

and author seems to be promoting second coin(token) in a few days, see https://bitcointalk.org/index.php?topic=5144479.msg51100521#msg51100521 which makes it even more suspicious.