Sorry. Yes, when running a CPC campaign on Facebook, you get 45% off per click if the landing page is a Facebook page. That's one good reason to have a Facebook landing page. I"m sure there are other good reasons too, like if you want them to get straight to your community engagement area.
Regarding the "likes". Go with a smaller box. The huge box that pulls in your feed plus has the people pictures gets approximately zero traction. The largest FB widget I would put on a site would be
similar to the one SEOMoz has on the right.
Looking at click patterns across several properties and niches, bigger isn't better with the FB widget. It's a laughably bad black hole in the heat map, and generates an astonishing ~30-40 requests per load, slowing down the page.