I'm sure other people have experienced this cause I hear people complaining. Basically, you log on to LetsBeef only to see every other word is a link to some bullshit ad. In the example screenshot below, they're indicated by the red arrows:

Well here's how to get rid of them.
Step 1) Hover you mouse over one of the links. An InfoLink ad should appear. When it does, look in the bottom-right corner for a question mark and an "X".

Step 2) Click on the question mark. It'll take you to an InfoLinks page where you can opt out to never see the ads again on that site. Scroll all the way to the bottom and you'll see the option. What you want to click is highlighted in yellow.

After this, the page will refresh and bring you back to the site and you'll no longer see those links again. If the same thing ever occurs, just repeat steps 1 and 2.