You filled 50% of profile information warning

I have a warning which me tells that I have only completed 50% of my profile information.

At the same time, I have filled in all my personal information - full name, address, gravatar, e-mail (and confirmed it), phone, skype, birthdate; my location information - institution, country and city; and "about me" section. Finally, in order to make this warning disappear, I have filled in all the social media links, where I have an account. There is nothing else I can add to my profile info.

However, this warning doesn't disappear.
Why? What are the actual requirements for 100% profile information completion?
I know that profile completion is not required, but this warning annoys me

Thank you.