Essentially, companies/products like Google (AltaVista, Lycos, ect.), Facebook (Friendster, MySpace, etc) or Slack (IRC, Skype, etc)?

IMHO, it's very rare to be working on something truly unseen; and if you are, the chances are numerous people are working on the same thing at very this moment, just in a different flavor. Aren't these incremental improvements part of the natural selection?

IMHO, you should strive to find meaning not in the external, but internally; you should start somewhere, however basic it is (fixing your bed and cleaning your room, before trying to change and help the world). Jordan Peterson talks about that in great detail - highly recommend his lectures (they're available online).