Ask HN: How to contact YC alumni who review YC applications?

I have seen a number of blogs by YC alumni who gratuitously offer to review YC applications. Despite my YCW13 late application still pending (fingers crossed) I am looking to YCS13. 1. Is it a good idea to have YC alumni review my YC application? (I am really interested in some unbiased feedback and the insight from those whose applications were successful must be helpful) 2. Most of these "offers" from alumni are year old posts, is there any suggestion on finding YC alumni who currently spend time giving back in this sort of manner?