Don't expect anything like TER in the way of reviews of individual providers. Most of the useful information in the forums is related to types of hobbying that are not really covered by TER, such as Backpage girls, streetwalkers, AMPs, strip clubs that offer extras, etc.
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There's an SB forum under Richmond, VA that's very active and has national participation.
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You can read all you want without joining. It can be pretty entertaining.