Ask HN: Any idea how many bots are here?

Considering the ease of account creation, do we have any notion of which people here are really people? Seems like karma farming and networks to bury certain stories / comments or promote others wouldn't be too hard. Not looking for special insight into giving away the measures taken to prevent such things, but I am curious if other fellow humans are also concerned over possible unwelcome bots

- A real hominid using a board of keys