I guess "bite" could mean criticism, but if read the rest of the paragraph it doesn't feel that way.

Of course, these tongue-in-cheek projects still have plenty of bite to them. Gmail’s Twitter account announced that 100,000 interventions were sent in the site’s first 24 hours, and that ‘Gmail Man’ video could help salespeople rekindle Gmail privacy fears that have largely died down over the last several years.

http://www.washingtonpost.com/business/technology/battle-of-the-goofy-email-campaigns/2011/07/28/gIQABRG4fI_story.html

I guess "bite" could mean criticism, but if you read the rest of the paragraph it doesn't feel that way.

Of course, these tongue-in-cheek projects still have plenty of bite to them. Gmail’s Twitter account announced that 100,000 interventions were sent in the site’s first 24 hours, and that ‘Gmail Man’ video could help salespeople rekindle Gmail privacy fears that have largely died down over the last several years.

http://www.washingtonpost.com/business/technology/battle-of-the-goofy-email-campaigns/2011/07/28/gIQABRG4fI_story.html