- Just a quick thing on the hosting: If Mashable is planning on covering you, you may want to invest in a dedicated / cloud server, and just downgrade later once the traffic wears off. I'm guessing that other blogs will write posts based on Mashable's recommendation, so your virtual server may not be able to handle it...
- One other thing on your homepage: Consider putting a call to action right in the center of your picture, saying something like "Get started now" or something like that.
- Take a look here to see what they did with their image in their A/B test: http://visualwebsiteoptimizer.com/split-testing-blog/how-to-...
- On the page with the live map, maybe have a popup / overlay after a few seconds that says something like "Connect with Facebook to see your friend map."
- Do you have any viral sharing features in there?
- You should try and make sure your site can convert before Mashable writes their article. It would also be good if it could be shared / spread virally somehow.
- Also, by "keep him updated," I don't think he meant that he was looking for increased traffic, he's looking for a story. You guys getting more traffic probably isn't the most interesting story in the world.
- Are you able to add something new and even cooler to it for later this week? If so, that could be your story.
Sorry that this comment is a bit of a mess. Hopefully this makes sense, and helps you some how.