TweetoClock
A Single Function SiteDescription:
TweetoClock let’s you find out what’s the best day and time to tweet someone on Twitter!
How TweetoClock works it out? The system on the site calculates which day and time the Twitter-er tweets most on, and returns the results along with 2 links, one to the Twitter user page, and the other to directly tweet the user (Tweet This).
The results are cached for 24 hours to reduce server load.