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Posso colocar em barra de anuncios o código do facebook, aquele para o pessoal curtir ?

IFRAME

<iframe src="http://www.facebook.com/plugins/likebox.php?href=http%3A%2F%2Fwww.facebook.com%2Fpages%2FRealnet-Provedor-de-Internet%2F210891702300826&amp;width=292&amp;colorscheme=light&amp;show_faces=true&amp;border_color&amp;stream=true&amp;header=true&amp;height=427" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:292px; height:427px;" allowTransparency="true"></iframe>

oooouuuuu

XFBML

XFBML

<div id="fb-root"></div><script src="http://connect.facebook.net/en_US/all.js#xfbml=1"></script><fb:like-box href="http://www.facebook.com/pages/Realnet-Provedor-de-Internet/210891702300826" width="292" show_faces="true" border_color="" stream="true" header="true"></fb:like-box>

Qual dos 2 posso usar na central e onde posso add para usar ?