I have only my own paranoid (?) suspicions about this, and no actual evidence but ...
I think some Cayman dive ops are quietly encouraging their customers to post glowing reports on SB. You will see a new member post 3 or 4 times, praising the dive op in glowing terms, and then disappear from SB. It seems they joined just to praise that one dive op. To some extent, this is legitimate; I assume the poster really does hold a high opinion of the dive op. But, to me, it is only 1 step removed from the dive op touting itself.
I think some Cayman dive ops are quietly encouraging their customers to post glowing reports on SB. You will see a new member post 3 or 4 times, praising the dive op in glowing terms, and then disappear from SB. It seems they joined just to praise that one dive op. To some extent, this is legitimate; I assume the poster really does hold a high opinion of the dive op. But, to me, it is only 1 step removed from the dive op touting itself.