Useful vs Useless
Adding to the required efforts, pre-filtering shared information, to ensure that only public, free, or worthless information is shared, also implies that the shared information is typically already available to all or most.  That may also imply, re-evaluating the collaboration effort investment relevance for sharing this public information.  Are the efforts worth the benefits?  If not, collaboration may be useless.  These issues can get seriously compounded when considering that information that is not identified and classified can not be managed, or the corollary that the better information is identified and classified, the better it can be managed and used.  Identification and classification require efforts that need to be factored into a collaboration value equation, as does also the confusion that can result from identification and classification limitations.