There's really nothing wrong with that If a person want's to share something on another person's profile, how would that happen if this isn't allowed.

User's however can turn off this functionality if they do not want others to post on their profile by editing their privacy. See my screen shot here, http://screencast.com/t/pRIzSqXh

Ok ... thanks very much for you swift reply. It is clear now !
So a user can turn this possibility "off" as you mentioned and/or we can also do that globaly in Profiles "Privacy" settings. Perfect !

Hi Claude,

You are welcome and yes, you can turn on or off from user privacy edit page or from backend profile's privacy setting. If you are doing it from admin profile privacy setting, remember to tick the check box 'Tick the checkbox to reset all user's default privacy under this profile. ' so that your changes will reflect all members under that profile

Have a nice day!