People of all ages use social media so what are some of the excuses not to use it. I'm to busy, I'm a private person. Not good excuses. We have many types of users. Some live on it and others jump on a few times a day. Just find a balance to not interfere with your real life interactions.
Twitter is more important than Facebook it has evolved to be a complement to your email account. Don't get caught off guard when someone ask's you for your twitter name and you say what?
Facebook is a good way to stay in touch with family and friends keeping some posts private and some public.
LinkedIn is a must for everyone it's your e-business card. Don't just open an account with minimal info to just be a stalker to look at other profiles. A must for job seekers.
Google+ my is my favorite. It's Twitter and Facebook combined. Google+ allows you to make some great connections all over the world.
Just get on social media and have fun. Keep in touch with the important people in your life.