One of our new members said today "Actually, thanks for your help but I have an answer now. Alas stackexchange won't let me post it for another 4 hours!"
What is he talking about and why can't he post? I don't remember encountering anything like that, so I presume it's a new anti-spam measure or similar. I'd like to know the specifics of what this measure is, so I can help people when they run into it.