There are two sources confirming the same trend for Google+: Compete shows a growth of 43% - in monthly visitors - from May to June. Experian Hitwise shows a gr

There are two sources confirming the same trend for Google+: Compete shows a growth of 43% - in monthly visitors - from May to June. Experian Hitwise shows a growth of around 35% - in monthly visits - in the same period. So I would think: Two analytical firms would hardly be wrong at the same time?