One of the greatest impacts of social networking is on the social skills of networkers. Older generations of networkers learned how to communicate and interact long before networking was even a thought, but much of the younger generations do not interact socially except at school and work, where social interaction is well monitored and minimal. Social networking has created a serious breach in the ability of young people to communicate and interact with each other. Children no longer play together; they network. Adults no longer seek physical companionship; instead, they choose to network and have little or no physical contact.
Facebook also lets you to make groups, have applications and have as many friends as you want - this assists you with getting in touch with people who like what you like, play games online, and make additional friends. One thing it lacks in is security from pedophiles. There is no 'report button' to report users, even if they are irritating you. It also has a social bookmarking websites, allowing you to keep your favorite websites in one place, as well as all your friends. Another wonderful idea only integrated by Facebook is the friend finder. It permits you to find friends in an instant, allowing you to connect to friends.
As you say, Every Ying has ts Yang. If I had been asked 2 years ago about facebook and twitter etc, I would have laughed you out of town with a chortle of "its all for kids and geeks" but since then I've moved away for a new job and FB is now the main way i am able to stay in easy communication with friends, be it by the laptop or the apps on my phone. sometimes its always an option to speak on the phone but a quick message on FB or twitter has allowed me to not only keep in touch but reduce/extend my list of friends to the point where I now know who WANTS to stay in touch and who cant be bothered.
of corse, theres the whole "how much info are these systems and companies using about me?" (hense why i use a silly name like this eveywhere i go) but overall Im grateful for the chance to have these tools to ensure i dont loose contact with those i care about.