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var delay = 250;
var until = 'faux123';

var a = new Array();
$('button[class*=follow-btn]').each(function() {
    var attr = $(this).parent().attr('data-screen-name');
    if (attr != undefined) {
        if (attr == until) {
            return false;
        }
        a.push(this);
    }
});
function unfollow() {
    if (a.length == 0) {
        'done!';
        return;
    } else {
        var button = a.pop();
        $(button).click();
        setTimeout('unfollow()', delay);
    }
}
unfollow();