Be careful with listcrawler, their reviews are like EM, some are scraped from other sites. Tryst is good, so is Twitter. Again, no reviews. But TOB is good for that. ;)
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Providers are the only reference allowed, but so far a lot of the girls are NOT doing that because we are responsible for whoever we say is okay. So if someone is stupid and gets banned, whoever vouched for her gets banned too.