Why Facebook Like buttons account for 16% of an average website’s code

According to data collected by BuiltWith.com, 6% of the top 10,000 most high-traffic sites load content from Facebook’s servers. For the vast majority of them, that content is likely Facebook’s Javascript SDK, a huge block of code that is needed to display such features as the Like button (as seen on many media sites) and Facebook comments widgets (also used on many big media sites, Buzzfeed among them).

This SDK code is so big that it represents about 16% of the total size of all JavaScript on the average web page.

Yikes. Surely not true?