I love how easy it is to keep track of my goals, whether they are big or small! There isn't much for me dislike about this system; however some things do need work before launching them into production such as notifications when friends update their profiles with new pictures etc because if you aren’t notified at least once per day then your goal might get missed.
If you want something simple but powerful then definitely check out lifesight - very helpful tool which can help any organization reach its objectives while keeping employees motivated by connecting in real time so everyone knows what others have achieved each week/month.