How about this, send a link to your site to all of your friends. Ask them if they'll share it with their friends - via email or text -> novel idea right? If people really like what you've made then you won't have to go around doing shameless self promotion and being a slave to Twitter and Facebook status updates on every little detail about your app, your company, or your team.
When did marketing an app become so ego-centric? I don't give a shit what you look like. I don't care how many people are on your team. I don't care whether you have 50,000 twitter bot followers. Does your app make me want to use it more? Does it fulfill a real need I have or invent a need I never knew I had? If it's reliable and I like it or need it then guess what: I'll use it.
Source: Google, Craigslist, Facebook, Twitter, Amazon, etc... Astronomical successes that didn't have the 'benefit' of a glitzy social platform to share their special sauce with the masses.