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Remix is the reworking or adaptation of an existing work. The remix may be subtle, or it may completely redefine how the work comes across. It may add elements from other works, but generally efforts are focused on creating an alternate version of the original. A mashup, on the other hand, involves the combination of two or more works that may be very different from one another. In this article, I will apply these terms both to content remixes and mashups, which originated as a music form but now could describe the mixing of any number of digital media sources, and to data mashups, which combine the data and functionalities of two or more Web applications.

Electronic transmission has already inspired a new concept of multiple-authorship responsibility in which the specific concepts of the composer, the performer, and, indeed, the consumer overlap. . . . In fact, implicit in electronic culture is an acceptance of the idea of multilevel participation in the creative process.2

It is common to assume that remakes or reworkings are inherently lesser forms of creation than something that is "original" and that free reuse somehow degrades the value of the source. Modern copyright law and the intense social stigma associated with a term such as plagiarism speak to such assumptions.

MIT's faculty members last week decided on a new policy to make all of their scholarly articles available free to the public online.

Faculty members voted unanimously to adopt the new policy, which is in effect now.

"The vote is a signal to the world that we speak in a unified voice; that what we value is the free flow of ideas,"

One tweet from "Dupree" appeared to be coming from inside one of the hotels: "Mumbai terrorists are asking hotel reception for rooms of American citizens and holding them hostage on one floor." A group of Mumbai-based bloggers turned their Metroblog into a news wire service, while the blog MumbaiHelp offered to help users get through to their family and friends in the city, or to get information about them, and has had a number of successes. Flickr also proved a useful source of haunting images chronicling the aftermath of the attacks. Journalist Vinukumar Ranganathan's stream of photos were published by CNN and other major broadcasters. iReport.com: Are you there? Share your photos, videos and stories A Google Map showing the key locations and buildings with links to news stories and eyewitness accounts, and CNN's iReporters flooded the site with their videos and images of the terror attacks.

However, as is the case with such widespread dissemination of information, a vast number of the posts on Twitter amounted to unsubstantiated rumors and wild inaccuracies. For example, a rumor that the Indian government was asking tweeters to stop live updates to avoid compromising its security efforts was published and republished on the site.

As blogger Tim Mallon put it, "I started to see and (sic) ugly side to Twitter, far from being a crowd-sourced version of the news it was actually an incoherent, rumour-fueled mob operating in a mad echo chamber of tweets, re-tweets and re-re-tweets.