The previous story about Zuckerberg's lawsuit caused me to do a little research. I have never thought much of the man, but there's really nothing wrong with the court action he's taken in Hawaii. What he's doing is a an "action to quiet title". Basically, he has already purchased the plots of land in question, from the majority owners. The problem is that the title to this land is unclear, because there are also many minority owners, most of whom really have no idea they own anything.
An action to quiet title is a court proceeding used to deal with such fuzzy ownership situations, to clarify them so that clear and unambiguous ownership can be established. It involves a process to find and identify owners so they can be negotiated with, or in the event they can't be found to legally remove their ownership to clear up the title. That last bit is unfortunate, but there's really no other way in cases where the ownership in question goes back many generations and has never been documented. The alternative is to leave the legal ownership of the property in limbo. I guess Zuck could do that, but if I were in his shoes I wouldn't want that... and I know because I am more or less in his shoes.
My wife inherited some property from her father. We have a "quit claim" deed that legally transfers the property to us, and my father-in-law had a quit claim deed from the previous owner, and so on back several steps. In our case, all of this was documented and recorded with the county (which is *not* the case with Zuckerberg's land -- so we have a much better position). Our problem is twofold: First, quit claim deeds are not warranty deeds, which means that while they're legal, they are only evidence of ownership, not a guarantee of ownership. Second, the legal description of the property boundaries was changed a few decades ago, and it's not completely clear if the new description actually matches the old one.
In our case, odds are very good that a title company can simply research the past sequence of titles, verify that everything is good, and issue us a warranty deed which guarantees our ownership. BUT there is a possibility that the research may find that there is additional cloudiness in the ownership, in which case we'll have to file an action to quiet title to flush out any other claims to the land and, if they can't be found within a certain time period (a year, I think?), to get a court ruling that we unambiguously hold title to the land.
This is a pretty common thing, and it's really not at all abusive.