Thanks for your answer. Indeed! I'm not sure, the main mission of my idea is to offer homeless/refugees a way of connecting to other people (it could be just for chatting or for meeting and offering some jobs in order to allow them to integrate).

The main problem here is that these people won't have an easy access to the internet so it might be easier a website but otherwise I think an app would be more suitable.

(probably worth go to the streets and ask them).