Students Zorica Micic and Ana Hansel at the Miami Ad School in Berlin have this spec idea that you should be able to add homeless people as your friend, on facebook.
Holding up signs, with their name (reminiscent of the Hello Project), the signs say "give me a place in society" and have a QR code, making you able to befriend them in the virtual world.
Then they plan to build internet stations for the homeless, where they can log on and maybe find some encouraging words of support from their friends. "Because if someone is down, friendship helps them get up again".
Lets just pray the homeless people never meet anonymous or 4chan trolls out there, the internet can be a very mean place.