Most of the times, boy create fake profile of girls with some random photos of pretty girl photo. If you receive friendship request from unknown girl or boy, you should first check the profile and photo to know if it is real. If you like the person by look, you should also check if the photo belongs to that profile. For this, use Google reverse image search.If you are on Google Chrome, you can directly right click on profile picture and select “Search Google for this image” option.
If you are on some other browser, Copy image URL and open Google images. Here, select search by image option by clicking on camera icon in text box.
After searching by the image, if you see many Facebook and other profiles using the same profile photo with different name, the profile is fake. Most of the times, people use Google images to search pretty faces to put as profile picture on Facebook. So, this method will help you.
Sometimes, reverse image search does not help. In this case, you need to check how active the profile it? And how this person communicate with other people on posts and comments. Now, check the timeline of the profile to see the activity and user engagement. You will get an idea about the profile.
If you still have any confusion, you can ask via comments.
You can use the same method for any other social networking website. This process can be used to fond fake photos on Instagram too.