title: Why parallel/concurrent access to graphAPI to speed up retrieval of data (say "likes") fails sometimes
body: <p>We have tried to speed up our app by getting the initial information on a user of our app through a set of parallel calls using several ironworkers (dev.iron.io) on a ruby on rails based system. 
  we have all the tokens needed. 
  When it comes to retrieving "likes" - it fails. Initially it failed ones in a while, now it fails all the time. So we end up with an empty-set for likes which crushes our app.</p>
  
  <p>Any thoughts/ideas/solutions to why this may be occurring?</p>
  
  <p>Can it be that the graphAPI has some problem with concurrent access to the same fbID?</p>
  
  <p>Help appreciated.</p>