The basic point is: You think your dataset is big, but it probably isn't. A well written C program running on a modern laptop can handle a few billion node sized graph dataset fine. Before paying for 128 cores running a "scalable" implementation, first check your dataset size. Is it in the terabytes? If not, you're probably fine running any computations on a single core.

Google and Facebook need cluster computing solutions like MapReduce and Spanner. You most likely don't, and are years away from needing one. Even a successful startup like SnapChat or Tinder could probably do all their analytics/graph processing needs on a single core. So worry about the other things first.