cademia.edu is a free social networking website and collaboration tool aimed at academics and researchers from all disciplines. Like Facebook or LinkedIn for academics, but not as annoying or distracting. Very focussed on academia.
Launched in September 2008, it became one of the largest social networking sites/portals for academics in 2010.
"Using Twitter for Curated Academic Content"
(Yes, you could do this or you could just use Zite or even Flipboard - apps freely available via iTunes. Mal Booth)
ScienceStage is a global, science-oriented multimedia portal that specializes in online video streaming, which is used to support communication between scientists, scholars, researchers in industry, and professionals. It is also used by academics and students as a virtual educational tool. Video content ranges from conference recordings, to interviews, documentaries, webinars, and tutorials. ScienceStage, as its slogan suggests, also functions as a 'hub' by creating a meta-layer that enables the networking of both users (individuals and groups) and content (video, audio, and documents), which forms an integrated multimedia and social networking platform for scientists.
For the best in academic information, go to a Ph.D. Blogs written by PhD's have great content and sometimes very frequent content. There are some blogs that are mostly aimed at other PhD's, but some are for the general populous. Enjoy topics of all kinds with expert information. You might even get some freebees.
Presentation about the costs of higher education (albeit US costs) and some alternative ways we can assist including more open access, social media and social networks.
"Store, organize, and share your education and research for free."
I've not used this, so not sure what it is like, but it looks pretty useful for some.