them for extra energy as a gift, which you can also return. having lots of friends can, at least, extend your playing time so that you can do more and accomplish more in one day.
in a hidden objects game, you get to use hints in order to help you find items or objects that you are having trouble searching for in any level. just like the energy, however, hints are not infinite. however, if you have plenty of friends in your team for that game, you get hints from them depending on how active they are in the game or how high their levels are.
that is how important friends are. 