run this in your chrome dev tools console to click "follow" in 1 second intervals.

auto-twitter-follow.js

but = $$('[data-testid*="-follow"]')
//for (i in but) {but[i].click()}

for (var i = 0; i < but.length; i++) {
  let button = but[i]
  setTimeout(() => {
    button.click()
  }, 1000 * i)
}