[mattl]

I don't really see how this is better than <img src=".." alt="You won't find me on Facebook" />

[err4nt]

Have you ever tried adding images for use as icons that look good on retina or HiDPI displays? I use icons for their perfect resolution at every size, no matter your pixel density :)

[mattl]

This seems to make things visual only, with no alternative text for others.