Very interesting and actionable. One thing I disagree is point #5 because your previous users could feel screwed.

Here are the 10 hacks

1. Guest post (send editor email with post and short intro)

2. Offer premium giveaways

3. Use Rapportive to find and connect with anyone

4. Use Hacker News (~10k to 50k visitors for #1)

5. Drop the app to free after a regular pricing

6. Create one day viral projects to promote your brand

7. Use share buttons

8. Distribute on AppSumo (+730k subscribers)

9. Reach out bloggers (provide value before asking for something)

10. Use Dropbox style to incentive and gamify signups

Accessible on this link http://tldr.io/tldrs/50c74e31babbb5f813000b32