There is a lot of profiles using other peoples photos. My cousin and I watch The tv show Catfish a lot and he notice they were using the internet to do image search on Google.com.
Here's how they do it..

Step 1: Go to Google.com

Step 2: up in the right hand corner you see the word image click on it. ( you should be on the Google Image page now)

Step 3: In the search bar you will see a camera icon click on it.

Step 4: Search by image you have two options 1: you can copy and paste a image or 2: upload an image. Click on Browse and download a image from your files.

What I like to do is copy and paste pictures into a folder then upload them into the search bar from there..

Good Luck in your search and I hope this helps you from being scam or catfish,,