Did you eat that chocolate frog?

Albus dumbledore left a chocolate frog on the counter. when he came back, he saw that it was eaten. He asked all three of the suspects where they where and what they were doing. Hermione said "I was at the pool" Ron said "I was looking for scabbers. he's been missing" Harry said, "I was posting selfies on wizarding facebook and posting pictures like, #goingtodestroyvoldemort" and asked Dumbledore if he will give harry a like on wizarding facebook. Albus Dumbledore told them to show their hands. When they did, they were all clean and there wasn't even a wrinkle on them. Who ate the Chocolate frog?