Simucal asks:
What is SO's peak time of day in terms of number of users on the site? I'm curious because there are times when I want to ask a fairly niche question and asking when the most number of users are on might be beneficial.
I did a quick query on non-deleted revisions, grouped by hour of day GMT time. Here's what I came up with.
Looks like the most popular time to post is between 15:00 and 22:00 GMT/UTC, at least for all Stack Overflow data between launch and today.
You'll have to convert those GMT hours to your local time zone, of course. For the USA, that's:
Eastern Standard Time GMT/UTC minus 5 hoursCentral Standard Time GMT/UTC minus 6 hoursMountain Standard Time GMT/UTC minus 7 hoursPacific Standard Time GMT/UTC minus 8 hours
I'm a PST guy, so for me that means the best time to post a question I needed an answer to ASAP would be at the beginning of this activity peak -- very early in the morning, probably around 7 AM to 8 AM. Ugh.