
Troovi is an easy photo exchange platform to share your photos in high quality. There's no need to register - Simply choose the photos you want to share and upload them. To share the photos with others all you have to do is to send them your unique link.

thredUP is where America's busiest families conveniently exchange kids clothing online. You can list the boxes of clothes your kids have grown out of and pick ones for them to wear.

Freally is a website where people can give away their unwanted items and others can receive them for free. It's a website that promotes recycling and green earth through people's generosity.

Phandy is a service for friends, family, and co–workers to communicate and stay connected through the exchange of quick, frequent answers to one simple question: What are you seeing?

Posteet is a social network for developers where you can share snippets, codes and tips:- Store all your favourite tips, tricks, codes and snippets in one place, accessible from anywhere.- Share your tips with everyone, friends FROM your watchlist or just keep them private.- Tag your tips with as many labels as you want, instead of wrestling with folders.

ResearchGATE is a web 2.0 platform designed for the need of researchers. With this new platform ResearchGATE want to change the world of science by providing a global and powerful scientific web-based environment, in which scientists can interact, exchange knowledge and collaborate with researchers of different fields.

WOT, short for "Web of Trust," is a community whose members exchange knowledge of websites: Can they be trusted? Are they safe to use? Do they deliver what they promise? If a site has a bad reputation, WOT will warn you - and save you a lot of trouble.

BookMooch is a community for exchanging used books. BookMooch lets you give away books you no longer need in exchange for books you really want. Every time you give someone a book, you earn a point and can get any book you want from anyone else at BookMooch. Once you've read a book, you can keep it forever or put it back into BookMooch for someone else, as you wish.

Truequi is an object exchange platform; It brings the exchanged objects to life and by that makes socialising real.

ReviewBasics lets you exchange ideas and gather thoughts on creative, interactive, motion, and written content in a breeze. Upload your content, and invite reviewers. Their feedback is reported back to you in real-time. It's Quick, Easy, and Hassle-Free.

Spottt is a free way to trade links that help like-minded websites promote each other

With Seeyouthen You configure your private wedding website the way you want it, then invite all your friends, family, and guests to register as your guest for free. Collect and exchange photos with everyone at all your events. With permission you can even add your professional photographer's photos for everyone to share.

eToro makes it faster and easier than ever to execute trades, watch your trading activity, share, and enjoy financial information - using real or virtual money. It is a unique and user-friendly foreign exchange trading platform, which combines multidisciplinary expertise from the fields of finance, software development, and design to bring you the next generation of trading.

italki is a language exchange and learning community. It's main goal is to help people learn languages. With italki you can find language exchange partners, ask questions, and get them answered. It is a directory of language learning resources with multiple language support.

Change.org aims to transform social activism by serving as the central platform that connects likeminded people, whatever their interests, and enables them to exchange information, share ideas, and collectively act to address the issues they care about.

Docstoc is a free online document exchange database and social networking site that allows users to store, search, and share virtually any type of document (word, excel, powerpoint, pdf, illustrator, etc…). Similar in concept to Flickr.com (for photos) and YouTube.com (for videos) Docstoc will be the online community for sharing all types of documents. The users will post, categorize, and rate thousands of documents that can be reused by other users for a variety of purposes.

doodledays is designed for parents with young children (less than 5 years old) residing in the US. doodledays members can select, track and review the quality of childcare services based on their own personal criteria. Members can also use the site to communicate with their daycare provider. Members can post their views, opinions, ratings and personal buy/sell/exchange/donate advertisements.

Yumondo is a social recommendation platform that helps you get more out of urban living. Yumondo platform links up online what’s always been connected offline: People. Places. Events. And all kind of things. People go to places that are run by people who hold events that attract people to enjoy their favorite things. You can organize your free time, and exchange ideas with other urban trendsetters all over the world.

Swaptree is a new and innovative way for people to easily trade the books, CDs, DVDs and video games they are finished with, for the ones they want, all for free. With swaptree, your collections stop gathering dust and can be used to acquire other items you want. By offering to trade a single item, you can choose from thousands of books, CDs, DVDs, and video games that you can receive in exchange. Best part: everything is free, you only pay shipping.

At Free IQ, the emphasis is placed on exchanging valuable information not frivolous entertainment. A unique feature enables site visitors to make purchases directly from a content provider. The product purchased could be additional video information, audio CD’s, E-zines, E-newsletters or even physical products. Free IQ processes each transaction and collects a modest commission.

The Karma Exchange is fueled by Karma Tokens created by the good actions of those who initially send them. Each Karma Token is sent from user to user carrying with it the fingerprint of each user who has touched or been touched by the goodness of each transaction. As the Karma Token travels through the exchange touching and being touched by users, its impact on the exchange grows.

iLetYou is built by its users. Users are encouraged to take advantage of iLetYou as a rental and exchange medium. iLetYou users see more movies, play more games, save money, make more money and have more fun. The iLetYou platform is truly about fun and you can meet users with same interest as you have.

Trendio is a stock exchange where words from the news are the stocks. The value of the words is calculated according to their presence in the media. It makes it possible to visualize trends in the media and try to predict what will make the headlines tomorrow in a cool community-based game.