Good Riddles

Question: Which kind of board can you use to insert letters?

Question: What is that comes out of a man, has no hand and has no legs but can make a hole on the ground?

Question: What kind of book can you use to go internet??

Question: I am lonely and yet you use me a lot. What am I?

Question: You will always find me in the past. I can be created in the present, But the future can never taint me. What am I?