We use them on our tours.
http://www.savannah-swings.com/tour01.php HOWEVER, we link the social media images to a social page
http://www.savannah-swings.com/social.php which is nothing more than a sign-up page. All active links to the social media sites are within the members area. No traffic leaks, affiliates get credit for all sales.
As an affiliate I've always stayed away from programs that have traffic leaks on their tours and no way to avoid them such as an alternate tour. Not only leaks to social sites but review sites, toplists, traffic trades, hardlink trades, and the traffic counters some people are still using.
As a program owner I stick to those same standards. No leaks...ever.