I guess there's various ways of doing this. But when I entered my url, it only did a gathering from the most recent of posts. Which means that the words of a certain unnamed governor came out as one of the biggest words.
Seems I got somebody on the mind a lot these days, eh? (click on the picture to see it in its full glory)
Try it. Go to Wordle.net. Enter the URL of a website or cut and paste your own (or someone else's) text. And then you can dabble. And then publish it.