Let's talk theoretically for a minute... If a site is ranking #3 and has a lot of outbound links, what would happen if most of all of those OBL's suddenly went to dead sites? For example, a competitor posts a bunch of links to your social media accounts and then you delete all of those accounts, would that page still rank? In theory I could see it going both ways. 1. Google thinks the site is less relevant because all of the OBL's are to dead/broken links. 2. Google doesn't care, the site stays relevant and ranking well. What do you think? Have you ever given that any thought?