Approval for iOS app store reviews? Apps have solicited my input, so after spending time to make a review, it seems my reviews are not posted. 

Do reviews submitted for Apps have to be approved by either the developer or Apple?
Yes, reviews submitted apps must be approved by Apple, in order to make sure that there it's not spam or contains swear words or such.

The reason that you are unable to see your comments, is likely that you have to wait awhile. Devs don't get to pick which reviews are down and which aren't. Also, if your review was for an earlier version, it, obviously, won't appear in "Current Version Only".