Javascript

So BlogLog changed their Widgets and they have Javascript which I can’t use because WordPress doesn’t allow it.

I can’t put a twitter icon on because it has Javascript and WordPress doesn’t allow it.

I can’t put a countdown clock to my birthday (47 days) because it has Javascript and WordPress doesn’t allow it.

If I get my own domain with wordpress as the host, will I be able to use Javascript, so I can put that stuff on the site?  and will someone help me if I do decide to do it?

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