This document provides 10 marketing hacks for startups, including guest posting on other sites, giving premium giveaways, using the Rapportive browser plugin to find emails, getting content exposure on sites like Hacker News and Reddit, optimizing for long-term traffic sources like Wikipedia and Quora through regular contributions, creating viral projects, optimizing use of social sharing buttons, engaging on LinkedIn groups, reaching out to relevant bloggers, and using invite incentives like Dropbox to gamify signups. The key is to only use these growth tactics if your product or service is truly high-quality and worthwhile.