Is it socially acceptable to slide in his dms?

Anonymous
I have a sorta internet crush. I follow him on ig and twitter and he does not follow back although he does like my ig photos (specifically selfies) I want to get to know him better, we have a few of my friends know him although we have never met in person, which is funny considering how many people we both know! Is it acceptable to slide into his dms? And if so how and what do I say?
Is it socially acceptable to slide in his dms?
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