What is Wiki-Jacking? As Rand explains, it’s the process of going to Wikipedia page of your enemy or creating one, and pointing lots of strong Wikipedia links at that page. You might also want to include a couple of external links. This will push Wikipedia to the top of the SERPs for your enemy.
Never do this to your competitor. All that will do is make it more difficult for you to get to the top of the SERPs.
What does this show us?
The power of internal link juice.
The power of trusted domains.
The power of internal anchor text.