Social selling is a sales technique that relies on social media to find, connect with, engage, and nurture sales prospects.
Unlike direct outreach, where you immediately reach out to a prospect, social selling is targeted at "warm" leads, the ones you already have some relationship with.
The relationships are established by sharing compelling content and personal, contextual interactions.
Different networks work better for certain industries and audiences; LinkedIn is better suited for B2B sales, while Facebook tends to be better for B2C.
Social listening is the practice of monitoring social media or other online resources for mentions of your brand, product, your competitors, or specific buying signals. This info can help you identify potential leads and engage with them directly or indirectly.