Has anyone experienced using an internal social network at a startup or small business? My company has grown from 10 to 30 employees across 3 states, and the o

Has anyone experienced using an internal social network at a startup or small business? My company has grown from 10 to 30 employees across 3 states, and the only communication tools used by everyone are Slack and Gmail. I don't think this is something most people here would bother to actively use. Is there a minimum threshold where it becomes more commonplace? Maybe with 100 people?