Is not correct ....It works only if the concact allowed to show his status to all users...If you go on msn options------>privacy you can select in a allowed list all other users(i don't know if is the correct translation)but if you select all other users in a block list no one who is not your contact will be able to see you...to allowed to show your status to everybody you can also uncheck the checkbox above the list......Greetings
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they really work. i have tested the BlockChecker 
