If you ask a girl for her number and she gives you her Instagram, does that mean she isn’t interested?

Anonymous
Asking for a male friend.
He asked a girl for her number the other night (they just met at a party) and she suggested Instagram and they both followed each other right then and there. She has like 1,050 followers. Just wondering if this is typical or if she isn’t interested?
If you ask a girl for her number and she gives you her Instagram, does that mean she isn’t interested?
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