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While there are some useful tips in this article, there also needs to be some cautions. As others have said, Linkedin is not a job board. And be very cautious about including any information that someone could use to scam you.
Additionally, the farther into your career you go, the less important info like GPA becomes. It may even look silly.
And unless you are unemployed, it is important to realize that your employer will be checking you out as well. So, instead of helping you find a better position, your Linkedin page could get you fired.