2: [Social proof] Ask a question
You're providing social proof that what you say is true. And by asking a question, you're actively involving the reader in the topic.
Examples:
3: [Number] Lies About [Something]
Anytime someone is being lied to, they want to know what the lies are and why they're being told.
Examples:
Use words like secret, shocking, surprising, little known, finally revealed and so forth to communicate that you've got something interesting to share.
Examples:
5: The [New Product or Method] that [Somebody] Now Loves
If your audience is skeptical of your product, or if your product is brand new and no one's heard of it, this can be a great headline.
Examples:
6: [Authority Figure] [New Information]
For the 'authority figure' you can use a celebrity, an authority in your niche, a particular organization or whatever.
Examples:
7: [Problem] [Solution]
This one is straight forward and easy to use.
Examples:
And there you have it - 7 headline formulas you can use for subject lines, book titles and of course headlines.