The number of people who are victims of stalkers is increasing. This is due to the photos they have posted on their social media.
From these photos, the stalkers determine where these people live.
ご質問ありがとうございます。
"The number of people who are victims of stalkers is increasing."=「ストーカー被害者の数は増加しています。」
"This is due to the photos they have posted on their social media."=「それはSNSに投稿した写真により起こっています。」
"From these photos, the stalkers determine where these people live."=「この写真から、その人たちがどこに住んでいるかをストーカーが特定します。」
ご参考になると幸いです。