MFile.io was created to be a fast, efficient way to share a collection of images in a polished presentation. It was designed with this one job to do, and it is completely free. It is a simple, elegant design-based solution to a common problem, with tremendous potential. Think of it as a Pastebin for images.
AdHipster is a free social media cross-promotion service: people share your ad for free, you share theirs in return.