Hopefully in the future Facebook can fare better than the illusion of Cydonia.
1976, low resolution.
2001, high resolution.
UPDATE: April 9, 2014.
With the new pattern recognition algorithm DeepFace , perhaps Facebook faces will be more distinguishable from Facebook visual interesting patterns from now on.
 Taigman, Y., Yang, M., Ranzato, M.A., and Wolf, L. DeepFace: Closing the Gap to Human-Level Performance in Face Verification. Conference on Computer Vision and Pattern Recognition (CVPR), 2014