How are you planning to make money? Coz if you don't make money, then either you are going to sell my data (not acceptable), or you are going to shut down future development.
So again, how are you planning to make money?
>Arcode displays targeted advertisements based on personal information. Advertisers (including ad serving companies) may assume that people who interact with, view, or click targeted ads meet the targeting criteria, such as a particular gender, age group and geographic area.
In my opinion, this is totally "acceptable," and even preferable: my personal information is abundant, and is infinitely and trivially "replicable." My money is incredibly scarce and finite. (And being righteously indignant is too expensive.)
Edit: Also, I agree with the general sentiment that this should be a native app, not this wrappered pseudo-web app thing.
Found this: http://us.linkedin.com/company/arcode
Looks like they are going to make their money by improving the email user experience.