This is because of recent update in Facebook GRAPH API. Facebook is now giving Silly Warnings to Liker Users , Just Ignore it and Click on "This was Me" option. This warning comes when you use liker for the first time or when you use different Devices to Generate Token, from next time you can generate the token Directly.
First of All we dont Store any of your information such as username, passwords, messages or anything. We just use Access Token in order to Fetch your Post and Display it, so that you can use it without any problem and get better User Interface (UI).