These sites need to access to your Facebook identity (or know who you are) in order to work. This also means that Facebook can track everything you do on these sites.
Re taq ruxaq re' nik'atzin chi ke ye'ok pa ri ab'anikil richin Facebook (o nrajo' nretamaj at achike rat) richin nitikïr nisamäj. Ri nuq'ajuj chuqa' chi ri Facebook nitikïr nrojqaj ronojel ri nab'än pa ri taq ruxaq ri'.