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Sign in with your Facebook password if necessary. If you are a Mac user, you may skip this step.  Press Ctrl-+ to zoom in. Repeat to achieve the magnification effect desired. Press Ctrl-- to zoom out. Press Ctrl-0 to set the zoom back to normal. Hit Option-Command-8 to turn the zoom feature on. Press the combination of keys again to turn the zoom feature off. Hit Option-Command-+ to zoom in. Hit Option-Command-- to zoom out.

Summary:
Go to www.facebook.com in your browser. Follow the steps below if you are a PC user. Use the following commands if you are a Mac user.