Earn Bitcoins for watching sites

http://www.bitvisitor.com/?ref=1Hbsb8vYqxnt77iCBJNirCdgAbPHSbEHsJ - Bit Visitor : Watch ad for 5 minutes and earn
http://visitbit.tk/?r=1Hbsb8vYqxnt77iCBJNirCdgAbPHSbEHsJ - VisitBit : Watch sites for arbitary time and earn
http://bitcoin4you.net/?ref=1Hbsb8vYqxnt77iCBJNirCdgAbPHSbEHsJ - Bitcoin 4 You : Watch ad for 3 minutes and earn