floyd mayweather and manny pacquiao meet in las vegas on may 2 .
fight is being shown on pay-per-view , with sky sports offering it in the uk for £ 20 while us broadcasters showtime and hbo are charging £ 59 - £ 66 .
fans could turn to social media using new live video streaming apps such as periscope and meerkat to watch the fight illegally for free .
read : mayweather vs pacquiao tickets sell out within 60 seconds .
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