Ask YC: Where do you advertise online? 17 years ago
(Posting from a junk account just to keep things a bit more anonymous.)
The company I work for spends over $50,000 daily on advertising, for a purely virtual (downloadable software) product. This is almost, but not quite, exclusively search advertising. Dollar-wise, over the past few months, the split is:
Google: 87.2% Yahoo: 8.8% MSN: 2.4% Ask: 1.0%
With LookSmart, CJ, NeverBlue and Right Media taking up the sub-one-percent slack.
This is (like other people have noted) largely influenced by what our product is. Search marketing (as opposed to display) is by far best for us, and Google is by far best of search. There is a chance there are some campaigns I've missed.