Inbound Marketing tips for startups?

If you are a startup and you don't have the budget here are some tips for Inbound marketing. Quora - It is still a good source of traffic and a platform where you can show off your expertise. Look for profile spaces, share your knowledge, and sell nothing; You can achieve thousands of views per month. Twitter and LinkedIn are some of the best platforms for reinforcing a company's brand. The biggest key to success is unselfishly sharing valuable knowledge. Build a network of interested people, offer your help pro bono; Guest articles. Many platforms and websites don't mind good content on their platforms. Look for niche platforms, offer your services (especially through the lens of your services/product); Communities. Sharing knowledge in LinkedIn, Slack, and Facebook communities can help you find new partners and like-minded people who will want to help you promote your company and may even become your advocates. I am starting to use these tactics for our product iStory. www.istorylive.com Let me know what you think, am I missing any?