Disclaimer: This article is for educational purposes only. Facebook’s API and HTML structure change frequently. While the methods described work as of this writing, they may be patched in the future. Always respect Facebook’s Terms of Service.
If you need to see a larger version of a profile picture, here is the safest and most reliable method:
If you want, I can generate sample code for:
Sometimes the _o.jpg link breaks (giving you a black image). In that case, try _n.jpg (normal size) or _c.jpg (album size). These are almost always larger than the default thumbnail.