Hoople - 4:11 am on May 23, 2013 (gmt 0)
There are sites that give a more detailed picture rather than a single number.
Try gtmetrix DOT com and pay attention to the waterfall reporting. It's not just the html....it could be the db loading.
I've found that social plug ins that use remotely served scripts and buttons are all over the place d/l time-wise depending on the hour of the day.