If your primary audience lives in America, then the time around 8 AM ET (Eastern Time Zone - that is, New York time), give or take an hour before or after, is the best time to blog your post to ensure that it gets the most comments and links. For Indians blogging (and Tweeting) for American readers, 5-30 PM IST is the best time, as New delhi is 9-30 hours ahead of New York time.

It is also helpful to know the reason behind the time - the morning time is sort of the new 'newspaper/what's new with the world' reading time for most office-goers of this world.