The 13th Annual Interactive Achievement Awards ceremony was held last night as part of the video game industry's Dice Summit conference in Las Vegas, NV. Games.com reports that the top honor in the "Social Networking Game of the Year" category went to Zynga's massively popular Facebook game FarmVille.

It was up against PopCap's Bejeweled Blitz, EA/Playfish's Restaurant City and Codebell's Farm Town. With nearly 81 million monthly active players (which Zynga is quick to note has already made it bigger than Twitter), FarmVille is far and away the largest of the bunch and in some ways a shoo-in for the award.

Still, it's yet another feather in the cap for Zynga, who recently raised $180 million in a funding round from Digital Sky Technologies, the Russian venture capital firm that also invested $200 million in Facebook.

Do you play FarmVille? Are there other social games on Facebook you think should have been considered for a Game of the Year award?