Evrywall was created based on an idea of communication across the boundaries of social networks.
What can Evrywall be used for? Who knows. But it is meant to be used for good. It is akin to Poste Restante, since the messages are not delivered to the recipients, but they have to come and see for themselves.
Evrywall is a public conversation platform. All Facebook and Twitter users have Walls here. You can use your social media accounts to post on anyone's Wall and reply to posts on your own.