You have to eliminate this counterpoint for the evidence to fully support your perception: people share stuff on social media because it's easier and actively encouraged.
Here's the counterpoint to that though: people share stuff on social media not just because it's easy, but because of the egocentric idea that "if I like this, I matter to the world." The egocentricism (and your so-called moral decline) started way earlier than that, though-it goes back to the 1990s when talk shows became the dominant morning and afternoon program in the TV days. Modern social media is simply Jerry Springer on sterioids.
Here's the counterpoint to that though: people share stuff on social media not just because it's easy, but because of the egocentric idea that "if I like this, I matter to the world." The egocentricism (and your so-called moral decline) started way earlier than that, though-it goes back to the 1990s when talk shows became the dominant morning and afternoon program in the TV days. Modern social media is simply Jerry Springer on sterioids.