Getting your information on wiki may not be the best. Try forums and you find a ton of answer to your questions. Bookmarking is good for you backlinks and SEO
I think you'd better to search some knowledge by google,and then if you still have some question,you can ask for us.
A method/process for web users to store and manage web information (web pages) on the Internet which can be available to everyone on the web and can also be store by them. In this system, users save links to web pages that they want to remember and/or share. There are several website providing this service to the internet users. With a small registration, anyone can have this service and can also share his/her bookmarks to other people available on net. More information here