the help texts in the profile (contact section) are misleading. Example facebook:
Helptext: "A link to your Facebook profile with a format beginning with facebook.com/"
I entered: "facebook.com/michael.tobisch.96"
The created link is https://dnncommunity.org/Activity-Feed/userId/facebook.com/michael.tobisch.96.
Therefore the help text should be "A link to your Facebook profile with a format beginning with https://www.facebook.com/".
This is also for the other links.