The service seems counter intuitive. You advertise "The safe way to manage your company’s Twitter accounts." yet using the service would mean giving access to a third party. We all know that security is hard and you're creating online password manager - if it will be popular, it will gain unwanted attention.

Sure, you are using an access token and not a password for the accounts, but that's not explicitly said anywhere. I suggest you improve the trustworthiness of Echelon on the landing page.