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What's the difference between social interaction and speech and language? Wouldn't speech and language impact social interaction, making it hard to differentiate?
I can see your point. In general speech and language are an essential part of social interaction. However, the two can be separated. For example, you could interact with someone without audible speech or language using facial expression, say. Also, you could use speech and language in a non social interaction by, say, making a video about something that interests you.
If you want (or haven't) you could look at the Wiki article to see how they distinguish the difference.
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I am Jack's inadequate social skills