Loudspeaker vector graphics with social network, software, computer and digital art platform icons: Apple, Microsoft, Tumblr, Wordpress, Virb, Last FM, Design Float, Netvibes, Friendster, Squido, Bebo, Share This, Mister Wong, Yahoo Buzz, LinkedIn, SlideShare, AOL, App Store and other social vectors.
This is clipart converted and broken apart that has been released into the public domain because the document says so, and its from NASA, a USA government agency. The publication is called "The Brain in Space:"
http://www.nasa.gov/audience/foreducators/topnav/materials/listbytype/The.Brain.in.Space.html