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In page Dunst Opening:

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The opening move 1.Nc3 develops the knight to a good square where it attacks the central e4 and d5 squares. Although quite playable, 1.Nc3 is rarely seen; it is only the eighth most popular of the 20 possible first moves, behind 1.e4, 1.d4, 1.Nf3, 1.c4, 1.g3, 1.f4, and 1.b3. As of February 6, 2009, out of the over 500,000 games in ChessGames.com's database, only 644—about 1 out of every 780—begins with 1.Nc3.[1] The third-ranking 1.Nf3 is 66 times as popular.[1] Some very strong correspondence chess players employ 1.Nc3 frequently, and it is occasionally seen over-the-board.