How to Use Facebook Image Search
Facebook assigns a numerical ID to all photos uploaded to the social media channel. Images downloaded from Facebook have that numerical ID as part of the file name by default. If you know this number, you can use it to find the source of the picture on Facebook. It might be the profile picture of the person who shared it or the person whose profile you are trying to find might be named or tagged in the image.
Right-click the image you want to search for on Facebook. Select Open in New Tab in Google Chrome. If you are using a different web browser, select View Photo, View Image, or a similar option. Look for three sets of numbers separated by underscores in the address bar or file name of the image, such as those highlighted in this example. Locate the middle string of numbers. In this example, that is 10161570371170223. This is the ID number you will use on Facebook to find the image. Type (or copy and paste) https://www. facebook. com/photo. php?fbid= into your browser’s address bar. Paste the ID number of the image directly after the = in the address bar. This example would appear as https://www. facebook. com/photo. php?fbid=10161570371170223 with no spaces. Press Enter to go directly to the photo on Facebook and find the profile on which it was posted. Privacy settings might prevent you from accessing the image on a Facebook page. If the photo is not public or the owner has blocked you, the photo might not be viewable.
Reverse Image Search: Facebook and Google Method
You can perform a reverse image search in Google using a photo posted on Facebook to possibly learn more about who posted it.
Right-click the image and select Search Google for Image. A new tab will open displaying possible matches for the photo. Alternatively, you can search for an image you have downloaded by uploading it or dragging and dropping it onto the Google Images search page to use the Google Reverse Image search. Remove the text from the search box, replace it with site:facebook. com, and press Enter. This tells Google that you only want to reverse image search Facebook and not other sites. Check the results to see if any is the profile of the person you are looking for.
Alternate Ways to Reverse Image Search
If neither approach lets you find someone by picture, there are other tools you can use to perform a reverse image search, Facebook or otherwise. For instance, you can upload an image to TinEye and find out where it has appeared online.