How do I text a girl who I knew from high school and never talked to?

It's been 4 years now since we finished high school, I stumbled across her Instagram account. Any advice for how I can initiate a connection? We never talked. We Just had glances back then. Should I just send her a text telling her that I know her from high school and would like to take her out for a date? Or should I just send a friend request and see how it goes?
How do I text a girl who I knew from high school and never talked to?
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