Already done:
https://news.ycombinator.com/item?id=6660089
http://i.imgur.com/mmPAztu.png
I didn't get much interest so I didn't bother building it :)
https://news.ycombinator.com/item?id=6660089
http://i.imgur.com/mmPAztu.png
I didn't get much interest so I didn't bother building it :)
It finds all the pictures on Instagram with the hashtag #forsale, post them on Craigslist, and contact the seller through Instagram when a buyer emails the Craigslist contact info.
Craigslist killed it.
a few others
http://new.soldsie.com/instagram-selling/
https://paytagz.com (Member of http://boost.vc)