Dropbox

Dropbox is a Web-based file hosting service operated by Dropbox, Inc. that uses cloud storage to enable users to store and share files and folders with others across the Internet using file synchronization. It was founded in 2007 by MIT graduates Drew Houston and Arash Ferdowsi as a I Combinator startup.

There are both free and paid services, each with varying options.In 2011 Dropbox also announced "Dropbox for Teams", a Dropbox service focused towards businesses and collaborative teams providing administrative control, central billing etc. Dropbox for Teams is still hosted on the web but has different pricing model.

Delicious

Delicious is a social bookmarking web service for storing, sharing, and discovering web bookmarks. The site was founded by Joshua Schachter in 2003 and acquired by Yahoo! in 2005. By the end of 2008, the service claimed more than 5.3 million users and 180 million unique bookmarked URLs. It is headquartered in Sunnyvale, California.

The site was re-sold to AVOS Systems on April 27, 2011 and relaunched in a "back to beta" state on 27 September that year.Delicious uses a non-hierarchical classification system in which users can tag each of their bookmarks with freely chosen index terms (generating a kind of folksonomy).

Twitter

Twitter is an online social networking service and microblogging service that enables its users to send and read text-based posts of up to 140 characters, known as "tweets". It was created in March 2006 by Jack Dorsey and launched that July. The service rapidly gained worldwide popularity, with over 300 million users as of 2011, generating over 300 million tweets and handling over 1.6 billion search queries per day.It has been described as "the SMS of the Internet.

Vimeo

Vimeo is a video-sharing website on which users can upload, share and view videos.It was founded by Jake Lodwick and Zach Klein in November 2004. 

They left the company in 2007 and 2008 respectively. The name Vimeo was created by co-founder Jake Lodwick and is a play on the word video, inserting the word "me" as a reference to the site's dedication to user-made video and is also an anagram of the word, "movie.

Slideshare

lideShare is a WEB 2.0 based slide hosting service. Users can upload files privately or publicly in the following file formats: power point, PDF, keynote or oppenoffice presentations.Slide shaks can then be viewed on the site itself, on hand held devices or embedded on other sites. Launched on October 4, 2006, the website is considered to be similar to Youtube, but for slideshows. The website was originally meant to be used for businesses to share slides among employees more easily, but it has since expanded to also become a host of a large number of slides which are uploaded merely to entertain. Although the website is primarily a slide hosting service, it also supports documents, PDFs, videos and webinars.

Super powers of enterprising teachers

Scribd

Scribd is a Web 2.0-based document-sharing website which allows users to post documents of various formats, and embed them into a web page using its iPaper format. Scribd was founded by Trip Adler, Tikhon Bernstam, and Jared Friedman in 2006.Scribd's major competitors are Docstoc, edocr, WePapers.

The idea for Scribd was originally inspired when Trip Adler was at Harvard and had a conversation with his father, John R. Adler, about the difficulties of publishing academic papers. He teamed up with cofounders Jared Friedman and Tikhon Bernstam and they attended Y Combinator in Cambridge in the summer of 2006.

The Perfect Finish: Special Desserts for Every Occasion

Prezi

Prezi is a cloud-based (SaaS) presentation software and storytelling tool for exploring and sharing ideas upon a virtual canvas. Prezi is distinguished by its Zooming User Interface (ZUI), which enables users to zoom in and out of their presentation media. Prezi allows users to display and navigate through information within a 2.5D space on the Z-axis.

Prezi is used as platform for bridging linear and non-linear information, and as a tool for both for free-form brainstorming and structured presentation. Text, images, videos and other presentation media are placed upon the canvas, and can be grouped together in frames. Users then designate the relative size and position between all presentation objects and may pan and zoom in and between these objects. For linear presentations, users can construct a prescribed navigation path.