>>To post an item for sale all you have to do is add #forsale $<dollar_amount> in the description and your item will go for sale imediately.

>>All your followers have to do is comment #buy on any item you have for sale and the item will be purchased for them.

Interesting implementation, great concept. It seems like a decent amount of consumer education would have to be done to get them on board with #buy. This idea is also subject to all the risk that goes along with complete platform dependence.

ie: if it gets big/popular enough, what's to stop Instagram/Facebook from killing it and implementing their own proprietary version?