In a recent development in cyber space AOL, Yahoo and Microsoft are tying up to sell ads on each other’s site. This exercise is an effort by three companies to get some edge against Google online marketing. The league has planned to sell each other’s “Class 2 display” inventory — leftover banner ads the companies can’t sell on their own. As Google is still new in field of banner ad business and depends upon search advertising for most of its earnings. Despite of all this Google’s ad business is on rise on much faster rate than the combined efforts of Yahoo’s and AOL’s.