I just wanted to share a quick post to show how I save my images for uploading online. Facebook in particular has a habit of leaving your images looking blurry and pretty unprofessional, especially if you have any text or lines on a white background. The best way I've found to avoid the dreaded fuzziness, is to save my files as a PNG rather than .jpg.
If you are new to Photoshop or Illustrator I may sound like I'm talking gobaldygook - but bare with me, it's dead simple!
When you are ready to save your pic, select file > save for web (not just "save", or "save as") and the above window will appear. This window allows you to preview the "optimized" image before saving, which is great because not only can you see the effects of the changes you make as you play around with the options on the right (I'll get to those in a moment) but you can also see how big the image will actually be.
So, on the right hand side, in the "Presets" area, select PNG-24 from the dropdown. I also like to click on 2-Up (at the top of the image preview) so I can easily see the difference between the original and optimised image as I update it.
I then change the width of my image to 450-500 (making sure I don't click on the chain link, so that the proportions of my image remain in tack and the image doesn't become stretched or squashed).
If I'm happy with how everything looks I'll go ahead and click save and follow the usual process to name select a location to save the file. Job done :)