I love seeing this problem tackled in YC! It's a personal issue thats effected my family & community as well, so much so that I've been focusing on helping try and solve it with Penmate (penmateapp.com). Seeing YC take interest in this speaks volumes, it's extremely motivating.
To the Pigeon.ly team -- If there's anyway I can help, lets get in touch. This definitely is a problem that needs to be solved. Best of luck!
Thanks! I spent a lot of time thinking about UX, so that means a lot (note: there's a full mobile version available at http://m.penmateapp.com) We've started allowing families to send a free letter and photos last week so that's helped quite a bit.
To the Pigeon.ly team -- If there's anyway I can help, lets get in touch. This definitely is a problem that needs to be solved. Best of luck!