Article bookmarking and organization

I want to create a website that allows users to bookmark, copy and save the URL, or copy and paste any article that they read to their space on the website. Every user will creat an account on the site and then they can create article catagories (ex: Wines, business, investing, College project, recipies, Hawaii vacation) that they can post articles to that they find or read online. The website will be called Articleize. The intent of the site is to allow each user to create a customized list of articles they find interesting that they want to save for future reading or reference. The site would work similar to Pinterest, but be for articles, lists, blog posts, etc. When the user finds an article they like on a website the user can upload the article to their account on Articleize and organize each article under a category that they create. They then have the opportunity to post the article to Facebook, Like the article, Tweet, Google +1, Embed, or email it to others. Loading Articles The user should be able to add an article to one of their Categories by: 1. Uploading it from their computer. 2. Copy & Paste the article 3. Copy and paste or add the article URL 4. Use Articleize button to send article to the users account. One problem to overcome is that many times articles are deleted or moved from their original URL. Anytime a user adds an article it creates a hard copy of that article so it is saved forever to their account on Articleize. the second problem is articles often appear on multiple pages on websites. The software needs to be able to capture multiple page articles. I need an Articleize button created so that the user can upload the button to their Google, Safari, or Firefox browser so they can more easily download articles they find interesting. The site should allow users to follow others similar to Pinterest. The users home page or acocunt page should display all of the categories the user has created with 2 line snipets of the 5 latest atricles placed in that category. Once the user clicks on the particular category all save articles should be displayed in 2 line snipets. Users should be able to create sub categories in each category for organizational purposes. The overall look and feel of the site should be clean. The Home page of the site should list the most popular articles that have been uploaded in the past 2 hours or artciles people you follow have uploaded most recently. An admin center will be needed and a way for users to login and registrer. Users should be able to add their profile to the site when they register.