Add a Facebook like button to a Mediawiki page

I am editing a page on a local Mediawiki install.

I would like to know if it is possible to embed a Facebook like button on a page i开发者_如何学Cn the wiki?

I don't have administrator rights, so I can't install any extensions.

If it's a completely internal installation, you could enable raw html in the config file but this could be a big security risk if it is a public wiki.