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: The suffix stands for "original," indicating this is the highest resolution version available on the server. Understanding the JPEG Format

If you are trying to track down where this image originated, you can use these methods: 17859053_1254964121291776_570026879_o.jpg

The string of numbers is not random; it acts as a unique identifier within Facebook's content delivery network (CDN): : The suffix stands for "original," indicating this

: Right-clicking the file and selecting Properties > Details (Windows) or Get Info (Mac) may reveal "EXIF" data, such as the date the photo was taken or the camera model used. How does JPG work and why (with an example)? : The suffix stands for "original