Create bots: These are the faces of the community in the early days.
Post Content Yourself: This will encourage users to post as well.
Invite some people you know IRL by email: This will get you some founding members to add content.
Add a reward system: Encourage users to share posts, posts things, invite users, like post, be active, etc. This will ensure that your users keep coming back to use this reward system.
Improve SEO and SERP: This will help you rank higher in search engines and therefore people will find your community better. If you have the best product in the world, but no one can find it, it is useless.
Improve Page load time: People are more likely to use a website if it is fast. Keep the loading time under the recommended 0.4 seconds.
Security: Websites have to be secure. Let people know that they can trust the information they give you whole heartedly. I suggest using CloudFlare or some other CDN/Proxy.
Brand: People need to know the brand they are dealing with. Use fun logos, offer free trials, be kind to customers, these are all effective ways you can build you brand from the ground up. The Brand in... (More)