I have no HTML knowledge myself but i just added in the like button for facebook and did a fix I found online about this. The like button is right, but still is showing my description. The article I read said something about 24 hours for facebook to update it.
@Susan: Yes, that's right. FB re-crawl the link after 24 hours. But I found a way to make sure that they're up-to-date. Just shorten the URL (using bit.ly) and use the shorten one when sharing it on FB