Although how you run your debugger varies greatly depending on the language and platform you're using, it's easy to figure out with a simple Google query.

A debugger tool allows you to take a peek at the information Facebook pulls from a specific URL. For example, if you share a link with an image, you can use the debugger tool to see what image ...

Generally speaking, a debugger is thought of as a tool to use after a problem is encountered, when its cause is not obvious. Although a good debugger is the best tool for diagnosing problems and ...