22. Why is social networking services seems to be necessary in our everyday lives while we didn't have much of these 15 years ago?

Social networking is important for many different reasons. These lets people stay in touch with each other more easily and reconnect with people they have met before but have lost contact with. These sites also make it easy to connect with people who share interests with you, even if you are not located very near each other physically. You can also use these sites to organize events quickly and easily and on very short notice.

Social networking is also becoming increasingly important and useful in business. As more and more people are using sns, businesses are discovering that they provide a very powerful marketing platform that can spread news about their products or promotions through word of mouth, without as much expense. 

 Think of social networking as a free way to promote yourself or your business as well as a great way to keep in touch with friends and family. Marketing is most powerful if you can keep your name in front of your audience on a regular basis. Social networking is an effective marketing tool for both businesses and individuals. It's as easy as taking a couple of seconds to update your status daily. You can use social networking to say great and positive things about yourself or your business. If you are looking for a job, you want to essentially publicize all the things you can't fit into your resume. Social networking provides a platform to promote your skills in a planned campaign. If you've got the chance, you'd take it right? Thats what sns are nowadays.