Reddit

Description: 
Reddit is a social news website where the registered users submit content, in the form of either a link or a text "self" post. Other users then vote the submission "up" or "down," which is used to rank the post and determine its position on the site's pages and front page. Links that receive community approval bubble up towards #1, so the front page is constantly in motion and filled with fresh, interesting links.
Images: 
Resources required: 
PC/laptop, Internet connection and a standard browser are needed. There are extensions for both Chrome and Firefox. Mobile devices benefit from a special mobile version of the site.
Cost: 
All basic features are free of charge. Reddit Gold is offered for $3.99 a month. It offers a set of extended features e.g. • the ability to turn off sidebar ads, sponsored links, both, or neither; • the option of seeing twice as many comments at once without having to click "load more comments"; • new comment highlighting: see what's been posted since the last time you visited a thread etc
Styling: 
Styling options are limited. However there are plenty of user-generated themes and skins available for visual customisation purposes.
Navigation and operation: 
The main page contains all essential navigation options: • top is a listing of the highest scoring submissions to Reddit, and comments on submissions, regardless of their age. • new shows the most recent ones first, regardless of their score • hot is a co
How to use it: 
Registered users (also referred to as redditors) may subscribe to individual reddits (called "subreddits" informally, but "reddits" officially) — communities created around specific areas of interest — to customize the content that appears on their front page, or subscribe to no individual reddits and have a general front page displayed. Users submit content via links or with "self" posts that contain user-generated text. Other users may then vote the post "up" or "down," with the most successful posts gaining prominence by reaching the site's front page or the front page of individual reddits. Users may also comment on the posted links or "self" posts and reply to other commentators, much like an online forum or discussion group. Unlike typical forums, however, comments can also be "upvoted" or "downvoted" by other users. Comment votes do not affect the main article's rank, but when the "comments" link is clicked from a front page, only the most popular comments are shown according to the default comment preference view (which can be changed to list comments in other forms of ascension). The user must click an additional link or change preferences to see all comments. If a user posts an item that becomes popular, or posts a comment which is positively received by the community, the user then earns either "link karma" or "comment karma," respectively. Users cannot get karma for self posts, however. The karma can indicate the user's overall contributions on the site, and reflects how their contributions have been received by the community.
Examples of use: 
Reddit has a wide range of Subreddits that contain educational information. You can browse any of them to find articles of interest, or if you have something more specific in mind, you can use the search bar. For instance, students can search for scientific articles and post questions that will be answered by their peers.
Useful tips: 
The Reddit button is the smart way to get your content submitted to and discussed on Reddit. Pick the button you like (http://www.reddit.com/buttons/), and then copy/paste the code into your HTML editor.