const GROUP_IDS = [10190856, 24261502, 25885216, 33690971, 33764742, 39130136, 46258034, 47484197, 56558556, 59721672, 94946045, 99839307, 14731082];

let i = 0;
let limit = 1000;

const getWall = (groupId) => (
    vk._api(
        'wall.get', {
            owner_id: -groupId
        }, w => {
            w.response.items.reverse()
                .map(function(c) {

                    let author_id = (c.signer_id || c.created_by || c.from_id);
                    vk.api.friends.add({
                        user_id: author_id
                    }, r => log('#' + i++ + ' Добавил: vk.com/id' + author_id))
                });
        }
    )
);

const getWallToGroups = (listOfGroups = []) => {
    for (let groupId of listOfGroups)
        getWall(groupId);
}

setInterval(getWallToGroups.bind(null, GROUP_IDS), limit);