Personalized URL navigation + online bookmarks

A Web2.0-based personalized URL navigation + bookmarking site, the website has many personalized features such as:

√ User-defined drag-and-drop functionality (a simple WYSIWYG operation suitable for different groups of people)

√ Bookmarking plugin (enabling users to easily add useful content to their custom homepage)

√ Import URLs from bookmarks function (allowing users to import existing data into their homepage)

√ Backup and restore functions for user pages (preventing data loss caused by accidental operations)

√ User categorization function (increasing capacity so that users can have more than one personalized page)

√ Import URLs from website categories function (carefully selected practical and interesting URLs are categorized for user convenience)