How big a monitor should I get for my computer?

Is there such a thing as too big a monitor? Assume I'll be sitting 18 to 24 inches away from the screen. How big a monitor could I get before it's just too big to view comfortably?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia��).