WeWrite is a tool for worldbuilding. Good stories require internal consistency, where all the pieces fit together in logical ways. Real life is a complex network of inter-woven autobiographies, as we move along through life with one another.
The disconnected and pornographic nature of post-based social media does not allow for worldbuilding to take place.
With WeWrite, you'll be able to engage in worldbuilding efforts in small communities of trusted collaborators, like your friends, family, coworkers, etc. Each of these groups have different worlds of understanding, different memes and inside jokes, different jargon and sayings.
The ability to view pages that link to the current page will allow you to visualize the interrelatedness of pages, allowing you to see the relationships between thoughts and not only the discreet parts of the system.
Worldbuilding is useful for book authors, journalists, non-fiction and fiction alike.
Worldbuilding is also helpful for rebuilding civic participation through the town square, in that we must have a correct conception of our town's specific conditions (the "map" of the world) before we can take it upon ourselves to change things for the better.
Notice how interlinked this page is with the other pages? That's an example of worldbuilding. Each utterance should tie in with the rest of the system.
If you're writing a fantasy story, all the technologies and material conditions and social relationships must make sense together. Primitive societies might be more communal given the low levels of material abundance. Advanced societies might be more atomized given the broad reach of technology.
If you're writing technical documentation, all the pieces must fit together harmoniously, you can't design one piece that's in disharmony with the rest of the system, lest you accidentally run into unintended side-effects.
If you're writing about a trip you went on, it's not just your perspective that's necessary to build out the full story. If everyone else on the trip could collaborate together, many of the details that would've been lost could be preserved. But nobody's nerdy enough to make a google doc for their trips. WeWrite intends to be delightful and engaging enough that people would enjoy collaborating on their little stories together.