Mashable, 28th October 2010

We know that users are spending increasing amounts of time online on social networks like Facebook, but when exactly are users the most active? Social media management company Vitrue just released a study that identifies the days and hours users are most active on the Facebook channels maintained by companies and brands.

For the study, Vitrue analyzed Facebook post data from August 10, 2007 to October 10, 2010 from more than 1,500 brand streams — more than 1.64 million posts and 7.56 million comments in all. Shares and “likes” were not included in the study.

Here are some of the big takeaways:

The three biggest usage spikes tend to occur on weekdays at 11:00 a.m., 3:00 p.m. and 8:00 p.m. ET.
The biggest spike occurs at 3:00 p.m. ET on weekdays.
Weekday usage is pretty steady, however Wednesday at 3:00 pm ET is consistently the busiest period.
Fans are less active on Sunday compared to all other days of the week.