Re: Why was my ad turned down.
There are a couple of ways of knowing why your ad was disapproved.
Firstly, you're emailed when an ad as disapproved which also provides the reason as to why.
Secondly, when you log into your account, go to the ads tab click Filter -> Create Filter -> click the drop down that is prefilled with "CTR" -> Choose "Approval Status" -> untick all but "Disapproved".
IN the Status column, you will have a speech box type thing next to where it says "Disapproved", hover over that and it'll tell you the reason why.