Answer:
You are my brother, but I am not your brother. Who am I?
I'm as simple as a circle worthless as a leader; but when I follow a group their strength increases tenfold. By myself I'm practically nothing.
I may be made of metal bone or wood and have many teeth. My bite hurts no one and the ladies love me.
One simple click, one simple flash. A piece of memory, for years I'll last. What am I?
If you have it, you donβt share it. If you share it, you donβt have it. What is it?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.