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I saw that Facebook like open-source software a lot. Is there some webmaster-specific reason why don't they use jQuery or another javascript library? Is that because jQuery/another js library has a "lot"[1] of kilobytes? Or another reason?

[1] I know it's only about 50kb, but you have to consider that's Facebook, a lot of traffic

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closed as not constructive by John Conde Jul 12 '11 at 15:51

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.If this question can be reworded to fit the rules in the help center, please edit the question.

The same question was closed at StackOverflow as not constructive. – John Conde Jul 12 '11 at 15:51
Okay sorry. I didn't search on SO as I think it belongs here – genesis Jul 12 '11 at 15:55
I don't have "the" answer, though it would look weird (at best) if google guys would use jQuery instead of their own gwt, for example. – Paolo Jul 12 '11 at 16:14
why weird? Even twitter use jQuery – genesis Jul 12 '11 at 16:16
@genesis Don't you think it would sound weird, if GOOGLE wouldn't use GOOGLE Web Toolkit in favour of someone else product like, to cite one, jQuery? – Paolo Jul 12 '11 at 17:45