Flickr is an online community where you can share photos, videos with your friends. It is available also for iPhone, Android, and Windows Phone 7. Registration not required.
500px is a new interesting social network for people who loves photography. A web platform where you can express yourself by creating a professional portfolio of your photos that you can share with your friends and see other people's work. Registration required.
Marker.to is a software that allows you to highlight text on a website with your mouse and share the highlighted pages with others on Twitter or Facebook. The software has to be installed before using it. Registration not required.
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