LetGo is a smartphone application for selling and buying without the middleman.
We are able to invite our friends as well or send an invitation through the social networks.
In case you need one, this is mine.
(http://www.letgo.hr/?my_placement=75973)
Personally, from my location, I can see lots of clothing and gadgets being sold, rarely something else.
This is relatively new service, so it will need some time to get around, but for what I can see, it is pretty popular.
What is your experience with it?
Did you try it yet?
