1.) It's a big waist of time
2.) nobody checks what i post
3.) A LinkedIn profile is useless
My tips for Linkedin: post at least once a week, share an article about the industry you're in with your thoughts, an original blog post, or a photo of you at a community event (no beer selfies please).
4.) In 10 years, social media will not exist
With the barriers social breaks down; distance, communication, visual sharing, etc., social media is here to stay.. it just might not look like your grandma's social media in a few years.
5.)I don't know what to blog about
a.) What you should write about: industry insights, food, cooking, hobbies, traveling, community events
b.) Who you want your audience to be: friends, relatives, future employers, industry professionals
c.) How often will I update it: Don't be one of those who start a blog and don't update it at least twice a month. I'm guilty of it from time to time but the important thing to know is that when you write, you're helping yourself become a better communicator and are sharing thoughts with those you care about.