Is There An Online Ad Bubble?: "Back in the mid-90s, during the original internet bubble, just about every consumer business plan (that wasn't about e-commerce) was about online advertising. Everyone was focused on getting eyeballs and making their sites 'sticky' for advertisers. However, the bottom fell out of that market when the bubble popped -- and people realized that online ads weren't that effective. So, now that everyone's focused on online ads, some are beginning to wonder if this is a bubble that will pop as well."—Techdirt