Pope Leo: "In recent years, many young people have approached the faith through social media, successful programs and popular online Christian witnesses. The danger is that a faith discovered online is limited to individual experiences..."

In recent years, many young people have approached the faith through social media, successful programs and popular online Christian witnesses. The danger is that a faith discovered online is limited to individual experiences, which may be intellectually and emotionally reassuring, but never “embodied.” Such experiences remain “disembodied,” detached from the “ecclesial body.”
To the Members Of The International Youth Advisory Body

A great reminder from the Pope that, while the internet can be a great tool for discovery, connection, and even evangelization, the Christian life cannot be exercised solely or primarily online. It's lived out in your parish, diocese, and community shining like a light to the world.

So the Pope didn't exactly say "touch grass", but...