The average like on a Facebook event posting drives $1.34 in ticket sales, compared to 80 cents per Tweet.

This data comes from Eventbrite’s analysis of 11 million tickets that the company sold in 2010.

Eventbrite Co-Founder and President Julia Hartz presented these findings in a speech at South By Southwest yesterday.

The company found nearly four times as much sharing of event information on Facebook than Twitter, and attributes that difference to the former having a larger membership than the latter.

According to the Eventbrite report:

Over the last six months, 40 percent of sharing through Facebook occurred on the event page (pre-purchase) , versus 60 percent of sharing which occurred on the order confirmation page (post-purchase). This tells us that the motivation to share is higher once the purchase is made and the attendee is committed…