When Is the Best Time to Tweet?

The recent "State of the Twittersphere" report had some interesting data to report this month. The report provided data points for the distribution of Tweets-per-Hour and Tweets-per-Day. They found that business hours during the business week in the US are the most popular. Their graph shows Tweet volumes spike between 9am -10am, 3pm-5pm, and 11pm-12pm. The most activity occurs at 11pm. The data does not provide the timezone.

Days with Highest Tweet Volume (highest to lowest):

1. Thursday
2. Friday
3. Tuesday
4. Wednesday
5. Sunday
6. Monday
7. Saturday

I can see why Monday would be a slow day to Tweet, due to the start of the work week. It seems as if more people are Tweeting towards the end of the week when they have less work to accomplish.