Only Twitter was an advertising company. And for that to run smooth, you apparently need a lot of staff. From people that ensure your Kelloggs ads don't appear

Only Twitter was an advertising company. And for that to run smooth, you apparently need a lot of staff. From people that ensure your Kelloggs ads don't appear below literal neonazi movies, to people that close deals on large advertising campaigns, to people that ensure the place where those ads appear (Twitter, the product) actually keeps running.