Some prossies will only deal by phone, others demand an AW booking and some want both, often without actually telling the punter and we are left second guessing whilst having to dance to their tune. I've missed out on several bookings thanks to not doing something I wasn't told to do in the first place - my powers of clairvoyance are pretty crap.
Being sceptical, there are prossies who only arrange things by phone, don't answer emails and totally avoid the booking system. If this is combined with hidden fb then I move on - comments that have been left as 'fb only' don't seem to appear. If the profile has fb from bookings against it, a mouse over will reveal the number of positives, negatives and neutrals, so the more dodgy ones out there avoid this by only dealing by phone.