More Better

Recently Jeff Atwood's Coding Horror blog had a great post about User Interface and Fitt's law.

As mentioned in the blog Fitt's Law has a couple of basic tenets. One is

Make clickable areas as large as you can. Larger targets are easier to click on.

Common sense, right?

I was thinking of this tenet when using facebook's UI control for accessing additional posts at the bottom of a screen. The facebook control looks like this:

It looks like a big button but the "Older Posts" text is the only clickable area. There's that whole big button-like area but the user has to hit the tiny text target!

Until I read about Fitt's Law this tiny target issue was just a nuisance. But now when I compare it to other sites it sticks out like a sore thumb. For example, twitter's UI control for accessing additional posts makes it easy and obvious:

Just hit anywhere in the giant more button.

Thats "more better!"