docs: def getFriends(self,user_id="astronauta.mecanico",write=True):
          """Returns user_ids (that you have access) of the friends of your friend with user_ids"""
          while user_id not in self.browser.url:
              self.browser.visit("http://www.facebook.com/{}/friends".format(user_id), wait_time=3)
          #self.go("http://www.facebook.com/{}/friends".format(user_id))
          T=time.time()
          while 1:
              h1=self.browser.evaluate_script("document.body.scrollHeight")
              self.browser.execute_script("window.scrollTo(0, document.body.scrollHeight);")
              h2=self.browser.evaluate_script("document.body.scrollHeight")
              if h1 != h2:
                  T=time.time()
              elif time.time()-T>10:
                  break
          #links=self.browser.find_link_by_partial_href("hc_location=friends_tab")
          links=self.browser.find_by_css(".fcb")
          friends=[]
          for link in links:
              name=link.value
              user_id_=link.find_by_tag("a")["href"].split("/")[-1].split("?")[0]
              friends.append((user_id_,name))
          tdict={}
          tdict["name"]=self.browser.find_by_id("fb-timeline-cover-name").value
          tdict["user_id"]=user_id
          tdict["friends"]=friends
          infos=self.browser.find_by_css("._3c_")
          mutual=0
          for info in infos:
              if info.value=="Mutual Friends":
                  if info.find_by_css("._3d0").value:
                      tdict["n_mutual"]=info.find_by_css("._3d0").value
                      mutual=1
              if info.value=="All Friends":
                      tdict["n_friends"]=info.find_by_css("._3d0").value
          if mutual==0:
              links=self.browser.find_by_css("._gs6")
              if "Mutual" in links.value:
                  tdict["n_mutual"]=links.value.split(" ")[0]
          if write:
              if not os.path.isdir("{}/fb_ids/".format(self._BASE_DIR)):
                  os.mkdir("{}/fb_ids/".format(self._BASE_DIR))
              with open("{}fb_ids/{}.pickle".format(self._BASE_DIR,user_id),"wb") as f:
                  pickle.dump(tdict,f)
          self.tdict=tdict
          return tdict