Facebook Auto Poker

/* Usage: load facebook.com/pokes, paste script into console
 *   To poke everyone, checking every second: auto(true, "", 1000);
 *   To poke a specific person, every second: auto(false, "Some Name", 1000);
 */

var auto = function(pokeAll, targetName, interval) {
    var poker = function() {
        var people = document.querySelectorAll('div[id^="poke_live_item"]');
        if (pokeAll) {
            for (var i = 0; i < people.length; i++) {
                var name = people[i].querySelectorAll('a[data-hovercard^="/ajax"]')[0].textContent;
                console.log("Poking ", name);
                var buttons = people[i].querySelectorAll('a[role^="button"]');
                    for (var j = 0; j < buttons.length; j++) {
                        if (buttons[j].textContent === "Poke Back")
                            buttons[j].click();
                    }
            };
        } else if (targetName !== "") {
            for (var i = 0; i < people.length; i++) {
                var name = people[i].querySelectorAll('a[data-hovercard^="/ajax"]')[0].textContent;
                console.log("Poking ", name);
                if (targetName === name) {
                    var buttons = people[i].querySelectorAll('a[role^="button"]');
                    for (var j = 0; j < buttons.length; j++) {
                        if (buttons[j].textContent === "Poke Back")
                            buttons[j].click();
                    }
                }
            };
        }
    };
    var timer = setInterval(poker, interval);
};