Go to Slideshare and create an awesome deck teaching a topic related to your startup.
Slideshare is basically a platform that lets you put powerpoint slides online and share it with the world. As slideshare is not a very crowded space right now, it wouldn't be too difficult to get your slide deck to show up in Google results. This trick not only will gain trust and branding for your company, but it will also bring you immediate users. When we gain trust and reputation of being an expert, you gain mind share, or you create thought leadership.
For a SUPER awesome Slideshare example, please see: www.slideshare.net/mattangriffel/growth-hacking