All you have to do is follow these basic steps:
1. Your main cover photo should be 851×315 px, 300 ppi and be saved as a .png. For some reason it is much sharper than an image saved as a jpg or gif.
2. Your thumbnail inset picture should be uploaded as 180x180px but it is resized by Facebook to 125×125. You may have to play around with the design of it a bit to get it to look correct.
3. If you use involver.com, you can create two links from their choice of apps for free. In the example above, you can see that I chose YouTube and Twitter. I didn’t like the stock images that involver.com used so I created my own, sized them to 111x74px and saved them as .gif and
uploaded them. To do this, click on the little arrow (it will have a number next to it).
Now click on the little pencil icon at the top of the image and follow the intuitive instructions to upload your new image.
Repeat the steps for each of the images/apps that you have added to this area.
You can see the finished result here:
Now, go ahead and pretty up YOUR Facebook page!