Social Bookmarking is a powerful tool for indexing.You can search about any type of news. Social bookmarking and social news allow you to specifically target what you want to see. Instead of going into a search engine, typing something in, and then searching for that needle in a haystack, you can quickly narrow down the items to what you are looking for.
I really don't know whether their behavior is strange or what. I don't use Yahoo Search. But I visit mostly Yahoo Answers and use Yahoo Mail.
i don't know why yahoo seems to be older than google and yet most of us targets google. yahoo is really also known for there good articles.
I use yahoo because our company Best Kiteboarding has cooperation with them about providing email service.