One effective way to locate someone on social media using their photos is through the use of reverse image search tools. Platforms like Google Images, TinEye, and Bing allow you to upload an image and search for matching or similar images across the web. This can help you identify where that photo has been shared online, including on social media profiles. The results may reveal the person's various social media accounts where they have used that particular image.
Another approach is to use specialized face recognition search engines like PimEyes. These tools utilize advanced facial recognition technology to scan the open web (excluding social media and video platforms) to locate instances where a given face appears. By uploading a photo, you can receive a list of indexed pages where that person's face has been detected, potentially leading you to their social media profiles. However, it's important to note that some social media platforms may have privacy settings that can limit the effectiveness of these search methods.