According to Official Guinness Records,
The longest line of hazelnuts consisted of 6,580 hazelnuts, measured 106.14 m (348 ft 3 in) and was created by the city of Cortemilia (Italy), in Cortemilia, Italy, on 16 August 2014.
For a complete list of 2014 records, please visit 2014 Guinness Records in Italy.