Give them a "shared language." This could be inside jokes, a mutual obsession with a niche hobby, or the ability to debate without ego.
For writers and creators: how do you implement this?
: 3GP (3rd Generation Partnership Project) is a file format used for mobile devices. It is a simplified version of the MP4 format and is used for low-bandwidth, low-resolution video content. 3GP files are typically small in size but may not offer the best video quality.