Don't recall any particular time which it occurs.
Here is the ad that pops up when I go to the forums for the first time each day:
http://www.wayne2.net/ad.jpg
Notice at the top the link that says, "Continue to the CNet forums". That link does not work. Clicking it does not work. I have to sit through the ad until it times out and then it takes me to the forum.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic