Legal action?

One of my fiancé’s ex (from back in high school) has been stalking me and my fiancé. for example I walk out of the apartment and I see her car, and her parked across the street and she zoomed off. I keep getting notices on an app I use that shows who has views your social profiles (insta and Facebook)

What got me fucked up is that she has little

Minions (about two chicks and a dude) who either park across the street or circle around the apartment . I have also found photos of me with my fiancé out on a date all over Snapchat.

In this instance I’m not sure what the legal actions would be since majority of it is on social media (Snapchat)

*i have told them verbally to stop and have DM to stop. I have my profiles on private now and have blocked them*