Didn't Facebook originate from wanting to make it easier to scope out the good looking co-eds?
Tte point is, a lot of meaning comes out of what started as a seemingly trivial pursuit. If Mark Zuckerberg were to have followed your advice, there wouldn't be a Facebook.
"Meaning" is arbitrary and can be extrapolated out of pretty much anything.
A multiplayer video game where you shoot aliens (to quote the posted article) can be a way for some people to find a sense of community they wouldn't find in real life for whatever reason, or a way for some kids to protect themselves from the world around them (parents divorcing, illnesses, etc.).
You cite Facebook as a product that's not humanitarian but has "meaning". Facebook was essentially started as a way for privileged ivy-league kids to talk about their college life and hookup. It may have become something bigger, but by your metrics it probably didn't start as something with "meaning".
"Make meaning— not trivial stuff" is a superficial, empty sentence which only achieves the goal of sounding good and making its writer feel good about himself.
