A new service called Tweriod determines when your Twitter friends are most likely to be online based on their historical activity. Using the service is rather simple, just allow Tweriod access your Twitter account and wait for a direct message notifying you that your activity graph is ready. Knowing the activity of your Twitter friends can be important if you want to ensure your tweets deliver the most impact to your audience—you know like being read or possibly retweeted. This is great insight for both consumers and businesses who utilize Twitter for a multitude of purposes.

Tweriod Graph