One Day with all Social Networking sites

YEDDA

This is similiar to Yahoo answers but we can query any kind questions.It can be used independently or it can be added as a widget with existing social networking sites.It is useful as different people from different set of societies can answer questions irrespective of site they visit

Facebook

Plenty of applications that can be added to your page which are developed by different persons and it also allows you to create your own applications or install third party applications

LinkedIn

This is business based social networking which is very useful to do business and is a combination of business and personal providing one stop solution

YouTube

The worlds biggest video search site and uploads can be done by any user.It is owned by google and it is used for searching details than google itself