Lots of people use Facebook Like boxes. If you make a page for your blog, Facebook will give you the embed code which you can easily paste into a widget space on your blog. I'd recommend it over the Blogger version.
I use Feedburner too. You set it up over there, and then reroute it on WordPress with a plugin.
Atom is the same thing as RSS feed. Depending on what blog software you're using they all say something different, but all of the modern feed readers know how to handle it.
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