Either you are spying, or you are being spied on. In the first case, be careful because you are not as anonymous as you think. If it is the second case, this card only confirms your suspicions.
If you're asking what to do in a situation, be careful when spying on someone. If you're being spied on, lock down your social media accounts, WhatsApp, and avoid talking about your life to everyone. If it's an ex stalking you, go to the police.