The document discusses how start-ups can leverage crowdsourcing to conduct marketing activities on a limited budget. It recommends crowdsourcing ideas, design and content creation, surveys, and promotions. Five tips for effective crowdsourcing are provided: provide clear directions, have an open mind, set a fair value, focus on important details, and avoid over-committing to ideas by committee. Crowdsourcing can help start-ups efficiently generate and test many ideas to find the best ones for marketing.