What's with all the in page non-pop up pop ups coming up around the place?

Apr 7, 2012 • {"_edit_last"=>"1", "dsq_thread_id"=>"654045740", "simplecatch-sidebarlayout"=>""}

I speak of this:

What's the difference between a pop up and those annoying in page pop ups? Nothing. They both suck and NO I won't like your stupid facebook page.