Few brands have tested the sometimes scurrilous terrain that is Twitter advertising more than McDonald’s. The brand has occupied the Promoted Trend spot nine times since November 2010, buying an ad unit that Twitter says costs $120,000 per day.

And whether it’s social media users questioning the “meatiness” of the McRib sandwich, turning #McDStories into ugly tales, or having urban dictionary fun with #Shamrocking, the burger chain has earned its social media stripes. Through the events, it’s appeared impervious, as consumers have at times run wild with its Twitter conversations.

In the blogosphere, the campaigns have stirred discussion on whether or not all social buzz is created equally. So ClickZ News interviewed McDonald’s social media director Rick Wion to get his behind-the-hash-tags take on Twitter.

“As a brand,” Wion said, “we know that sometimes critics will take shots, but our primary focus will always be on fans and engaging with customers.”

Here are highlights from the recent email interview:

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via McDonald’s Addresses Twitter Critics | ClickZ.