1. HubSpot scaled sales using data science and social selling by focusing on prospects' needs and interests rather than the sales team's needs. 2. HubSpot used inbound marketing like blogging, SEO, and social media to get found where prospects were searching, and created a content engine to generate leads. 3. HubSpot used technology like Sidekick to source leads faster by monitoring prospects' online activities and engaging them based on context rather than just cold calling repeatedly.