Let me explain here what our service does, since our landing page is not quite clear:

1. You connect with Facebook (and optionally Twitter/Tumblr)

2. We bring in all the links you have shared over time on those platforms (not your personal pics or status updates, just links)

3. You can create collections of your items and share them back to twitter/fb if you like

It's taking your existing activity from the social web, and helping you save and curate it.