Just use this free web tool at http://tools.vngoogle.com OR http://tool.vngoogle.com
Step 1 : Click Copy Link
Step 2 : Send Link to Account you need IP
Step 3 : Waiting 10 seconds and click GET IP
Just very Easy to get IP from yahoo messenger
Good Luck
More today : You will get location of victim!! you can use it to check victim invisible or not !!!
Get Yahoo IP, Check Yahoo Invisible
Video Demo
Because This way realy Effect so Youtube has lock me in Hacker and they lock my video but i has upload another one...