There are many sign of stalking to be aware of.

• Repeated phone calls (including hang-ups)  and making annoying or threatening phone calls
  Vandalism of victim’s property
• Following victim or showing up at places victim frequents
• “Drive-bys” of victim’s home, work, school, friends, etc.
• Information gathering on victim – via the internet, post office, utilities, employer, school, etc.
• Sending letters, gifts, photographs, mementos
• Making false police reports against victim
• Contacting family members and friends of victim
• Violating restraining/stayaway orders
• “Spying” on victim and/or taking photographs of victim
• Using social media to find information about the victim
• Harassing the victim through social media 
• Posting intimate photos of the victim without permission - revenge porn