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Remobo creates an Instant Private Network ™ (IPN) between users. It's like a computer network for your social network... Just login, add users to your buddy list, and Remobo will create a secure network for you to: Remote control your home computer and access files while at work or traveling. Privately share large files like photos & docs between computers or with friends & family. Replace your existing, costly and difficult to use VPN software. Run games, video conferencing, streaming media, secure instant messaging & more!

Student blogs requiring no email for account setup. Blogs can be private or semi-private (password controlled), and teacher and/or tech admin has complete control.

Create Twitter and Facebook connected networks for courses. Messages can be publicly or privately displayed.

Free, private social network/microblogging tool for schools.

Beautiful, zoomable presentation tool. Currently still in private beta, and they sound stingy about invites, but very nice looking site!

"Penzu is a free online diary and personal journal with a focus on privacy. Easily keep a secret diary of thoughts or a journal of notes and ideas secure and on the web." Also allows users the option of sharing pieces.

Set up private, educational microblogging networks.

Enter a problem, and a unique URL is created. Once shared with others, a group can collaborate by adding questions, comments, solutions, etc. Very easy to use and effective way to solve problems.