CLEAN : New Yahoo! messenger combines text with soundless video

The video discusses the challenges and opportunities in audience engagement, particularly focusing on the role of audio in public communication. It highlights the limitations of audio in certain contexts and introduces a product designed to bridge the gap between texting and live communication, aiming to enhance expressiveness without the constraints of audio.

In what ways does the speaker suggest that audio can inhibit conversation?

What does the speaker mean by 'expressiveness' in the context of audio communication?