I'm using the Ultimate Facebook plugin with the "BP Social" themem from wpmu dev, and I've been having this refresh problem. I'm trying to track down where it's coming from. The easiest example is right on my logged-out homepage.
Here, I've added the [wdfb_connect] shortcode into the theme below the regular registration. It seems to be doing an endless Ajax-type refresh, loading the button over and over. I had the same problem, adding the "Like" buttons to posts and articles, except it would refresh the entire page every couple of seconds. This one has been a real problem for the site. Do you have any suggestions?
You can view this behavior on my live site, on the front page http://steubenonline.com
(I have asked the same question to the theme developer, in case the issue lies there, but I'm doubtful)