cliff notes:
-Zuckerberg bought 700 acres in Kauai.
-Through a law dating back to 1850, some locals may have inherited rights to 8 acres of the 700 he bought.
-Zuckerberg has filed suit to give notice to anyone who may have some claim to this 8 acres with the intent to buy the rights from them.
-This is a common conflict in Hawaii and this is the normal process to deal with it.