Sending a message to an old classmate you don't know that well on social media?

sage-of-caring
So one of my Facebook friends post a lot of stuff that is in line with my thinking, and biased on her "likes" of my posts it seems mutual. She was a high school classmate, (high school has been almost 10 years ago) and I don't really remember her all that well. Nevertheless she seems like an interesting person and the type of person I'd like to persue a relationship with. Is it weird to just private message her out of the blue? should our knowing eachother from school matter or should it be a entirely new thing?
Sending a message to an old classmate you don't know that well on social media?
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