Facebook adds 5 divs, 9 spans and 30 CSS classes to every post in the timeline

I'm curious to know what the actual overhead is of doing this. Not that I'm defending the crap Facebook pumps into our computers, but is "5 divs, 9 spans, 30 CSS classes" actually a useful metric in measuring the performance of a page? If it was 4 divs how different would things be?

Well take the gzipped amount of data that adds up too then the average cache time it lives in the browser times the number of impressions and additions and you'll get a good metric for wasted bandwidth at least.