There are different forms of usage rights, though. Like I said, I'm positive it would not be a good idea to simply republish all of FB/insta/twitter's data else

There are different forms of usage rights, though. Like I said, I'm positive it would not be a good idea to simply republish all of FB/insta/twitter's data elsewhere, but just as some software licenses allow you to use the code however you want so long as you do not redistribute it, I'm wondering if there are legal/ToS policies that allow limited use of the data (or specifically, what the official policies of these companies are w.r.t this).