Hello,
I have some dating ads approved in a matter of a few minutes but then since today even if I bid median suggested price, no impressions...
What could be the potential reason of it?
I still have a low spending limit. Could it be the cause?
Thanks
What country/age/gender group are you targeting and what are you bidding?
It must have been an issue from Facebook side.
I'm in a FB skype group where some people encountered the same issue.
Because shortly after posting that message things went back to normal. STM has magic powers 
I set bid to +50% above suggested price. It's really help to start getting impressions. After that I lower bid to comfort level.
Also don't creaty too many ads. And don't limit budget below $50 (even if you just testing).