We built a game for facebook http://apps.facebook.com/jibrjabr that uses images created in illustrator and exported as gif.
This is a high res version of one of the achievements as it appears on the achievements page
When you "Brag to your friends", FB will place a statement on your wall that includes a image scaled from the one our app provides to the 90x90 size they store on their CDN.
The 3 images below are from left to right:
90x90 from FB, 90x90 from AI, 90x90 PNG24 from Illustrator
The designer, (also my girlfriend) is going nuts over the way the 90x90 jags up around the outside of the circle. So she goes to create 90x90s directly from illustrator to get around this problem and it appears that Illustrator is doing only marginally better than FB did.
Is it just impossible to get nice smooth edges at this resolution? Is there some trick to getting the small image to look as nice as the larger one? Is the transparent background causing this?
They are 256 color gif images. She's tried exporting them as PNG24, but gets the same effect.