I'll show you an easy and effective way to check an ip address on yahoo. You'll need an yahoo e-mail account, and for this person to have e-mailed you. Whether you're trying to find someone that you've lost touch with, or someone is harassing you, getting the IP address helps. IP address can be used to help find someone's location. This is free and a legal way to find one.

The messenger list in Yahoo! Messenger is who you communicate with. To communicate with a contact, you both must have the Yahoo! Messenger application and you must be on each others messenger list. Once you have your messenger list set up, you can work with it to make it fit your needs.

Welcome to Yahoo! Year in Review 2009. Yahoo!'s Top 10 Searches often tell us more about our guilty pleasures, distractions, and obsessions than news headlines do, like this year's continued pursuit of online gaming, reality TV, sports, and starlets. The unexpected death of a troubled legend also drew record Web traffic and tributes.