FlockSocial: Instagram Growth Service
FlockSocial is a company that can help grow Instagram profiles safely and securely without using bots or fake followers.
Buzzoid Safety
Buzzoid is considered completely safe as they do not require passwords, and their site is secure with https.
Identifying Instagram Stalkers
To identify if someone is stalking you on Instagram, post a story, wait a few hours, then check your story viewers list. Top viewers are considered as stalkers.