I built a chatbot to fight loneliness and social isolation for seniors. It started with my grandma. She doesn't have a smartphone and internet, so it basically transforms photos into real postcards. She receives it directly in her mailbox, and it makes her really happy. The chatbot also reminds me to send when I did not, so she keeps updated regularly.
I released it to the public last week. you can find it here https://postcard.im (the link open a fb messenger conversation with the chatbot)