Check your WordPress theme. Usually if the problem is NOT within a plugin, then some core function of the theme itself might cause these redirects.
I used to have this problem a while ago and the solution was:
I've checked in the Editor in the WordPress dashboard all the .php files, and in the header.php file there was one line:
<script type="text/javascript" src="http://w.sharethis.com/button/buttons.js"></script>
So - the core function of the WP theme (using sharethis.com JavaScript - .js file) for sharing the content (on Facebook, Twitter, Google+) was causing all these redirects. I simply removed this line:
<script type="text/javascript" src="http://w.sharethis.com/button/buttons.js"></script>
and all the redirects went away! :-) The site is loading much, much faster now!
Hope that helps! Cheers, Alex