Well, I usually see such desperation for a VR come from anons that are uncertain if a person is real or fake. Now, I don't if that's what he/she wanted, but if it was, I'm assuring them that you're the real deal. As for how I knew your Instagram... No idea.
Allow me to stick my nose in this conversation. One: You can only send VRs (as we call them) in the mobile apps. Two: Anon, she posted a video response on her Instagram story. Three: IG story shows that she used Ask.FM on PC, so.