Job ads cannot be commented on. Right now on the frontpage that's "TrueVault (YC W14) Is Hiring a Head of Engineering". From the FAQ "Another kind of job ad is

Job ads cannot be commented on. Right now on the frontpage that's "TrueVault (YC W14) Is Hiring a Head of Engineering". From the FAQ "Another kind of job ad is reserved for YC-funded startups. These appear on the front page, but are not stories: they have no vote arrows, points, or comments. They begin part-way down and fall steadily. Only one is on the front page at a time."