Is there a way to tell what time people are on social networks the most?

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http://www.daniweb.com – I'm very curious if there is a certain time in the day when people are on social networks more, or any site for that matter and I was hoping someone could point me to a site that shows you hour by hour traffic for websites. I know that in the apache control panel of your own website you can see hour by hour site popularity, but I don't know if there is a way to see that for other sites without being an admin. (General)