I think it is because performance. Visit techcrunch (23) or huffingtonpost(30+) for example with an extension like ghostery which shows how many external js lib

I think it is because performance. Visit techcrunch (23) or huffingtonpost(30+) for example with an extension like ghostery which shows how many external js lib gets loaded. I don't block js but I block flash and it is for the same reason. My record is around 40+. I don't know why do they need that many. See reddit, loads 2 I think.