Atype of touch screen that can be up to four feet by six feet is a(n) plasma screen multitouch interface electronic paper display electronic notebook

The answer is a multi-touch interface.

A multi-touch interface makes it possible for a touchscreen to sense input from two or more than two points of contact at the same time. This type of technology allows you to use multiple finger gestures to do things like spread your fingers to zoom out, pinch to zoom in, or rotate your fingers to rotate an image. An example of a multi-touch design is the large wall-mounted screen that you see on CNN. The size of these screens can measure from four feet by six feet or more.  

a  social news website  is an  internet  website  that features  user-posted stories. such stories are ranked based on popularity, as voted on by other users of the site or by website administrators. users typically comment online on the news posts and these comments may also be ranked in popularity. since their emergence with the birth of  web 2.0, social news sites have been used to link many types of information, including news, humor, support, and discussion. all such websites allow the users to submit content and each site differs in how the content is moderated. on the  slashdot  and  fark  websites,  administrators  decide which articles are selected for the front page. on  reddit  and  digg, the articles that get the most votes from the community of users will make it to the front page. many social news websites also feature an online comment system, where users discuss the issues raised in an article. some of these sites have also applied their voting system to the comments, so that the most popular comments are displayed first. some social news websites also have a  social networking  function, in that users can set up a user profile and follow other users' online activity on the website.