How to find if someone is invisible or online or offline in Yahoo.

So here is simple way to find out who is invisible/offline/online in yahoo.
Just paste the following code in address bar & follow the steps & see the status.
http://opi.yahoo.com/online?u=insert Yahoo ID&m =g&t=2
replace the "insert Yahoo ID" with the yahoo email id of the person and open this whole address into the address bar and hit enter ,
eg: let id is crypto@yahoo.com then the url must be like this:
http://opi.yahoo.com/online?u=crypto@yahoo.com ID&m =g&t=2
u can search for all ur friends, whether they are online or offline.
Note: m can has values g or t, t stands for text and g for graphics whereas t can be 1, 2 or 3 for size of text or graphic

Other ways are to use some sites to find out the status. just open any of one site given below then enter the email id which u want to investigate.:

www.xeeber.com
www. yahoo-status . com /
www. scanyahoo. tk /
www.invisible-scanner.com

Source: Internet