Elgg is free and open source social networking platform that powers all kinds of social environments, from a campus wide social network for your university, school or college or an internal collaborative platform for your organization through to a brand-building communications tool for your company and its clients.

If you are looking to create your own social application, want to build and run a site for your organization, or introduce a social layer into your technology stack, Elgg is a great choice.
Elgg provides the components you need to build a fully-featured social environment, including:

• Profiles
  Elgg comes with default profile fields that can be extended or completely customized by the site administrator.

• Activity Streams
  The granular activity stream feature ensures you keep up to date with all site activity.

• Blogging / Microblogging
  Blogging and microblogging functionality that is both powerful, yet simple to use.

• Groups
  Collaborate around specific topics via public, private or hidden groups.

• Access controls
  Control who can access your content.

• Web Services API
  Expose functionality through the REST API by building a plugin and then either publish the API for other developers to build clients or provide your own.

Mahara is a fully featured open source electronic portfolio, weblog, resume builder and social networking system, connecting users and creating online communities. Mahara provides you with the tools to create a personal and professional learning and development environment.

What makes Mahara different from other ePortfolio systems is that you control which items and what information (Artefacts) within your portfolio other users see.

In order to facilitate this access control, all Artefacts you wish to show to other users need to be bundled up and placed into one area. Within Mahara this compilation of selected Artefacts is called a View.

You can have as many Views as you like, each with a different collection of Artefacts, and intended purpose and audience. Your audience, or the people you wish to give access to your View, can be added as individuals or as a member of a Group or Community.

ePortfolio owners create Views using a 4 step process and Views have the following features:

• ePortfolio owners can receive public or private feedback on their View and Artefacts within that View.
• Users accessing a View can report any objectionable material directly to the Site Administrator.
• Users can add Views and Artefacts within a View to their Watchlist and receive automated notifications of any changes or updates.
• ePortfolio owners can Submit a View for Assessment by a tutor or teacher allowing for a snapshot of the View and associated Artefacts on a certain date.

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