It's not small-scale at all: millions of users' attention and retention is at stake in the coveted 18-35 market, and younger. Ever since Snapchat turned down Fa

It's not small-scale at all: millions of users' attention and retention is at stake in the coveted 18-35 market, and younger. Ever since Snapchat turned down Facebook's offer to be bought out (for a cool $3 billion, inexplicably to many at the time), this feud has been on.