Mistake #3 – Your Profile is Private
Your LinkedIn profile should always be public, even if you feel the need to remain somewhat anonymous. If you have to, you can omit certain personal identifying details. But you must make your profile public if you want to be effective on LinkedIn.
There are times when you might really need to be private, such as when you are actively seeking employment while already working elsewhere. You might want to keep your job search a secret from your current employer.
But unless you have a very good reason for having a private profile, you are best served by keeping your profile public.
Keep in mind that LinkedIn has a number of privacy settings that can help you control what people see on your profile. This way you can keep relevant information visible to everyone while still keeping certain information visible only to those you really want to see it.