Keepio is a social media service that allows users "to inventory, share, sell, trade, review, or borrow from friends using a network of trust."
Keepio is a great way to keep running track of your possessions and tally your belongings. It is also a great alternative to Craigslist and eBay as it provides members with better privacy and the option of limited access visability. There are also no transaction fees involved in terms of selling, sharing, or swapping personal items.
Additionally, Keepio can function as a private or public community, with affiliation on Facebook and Twitter, that allows users to buy and sell among networks of trust.