Notices (-5), what does it mean?

Id got this just a moment ago in my notification menu... Just wondering what that (-5) means!

celiamerula

I get this when I reply to eg friends interactions.  I think its just outgoing messages?  Reloading the page gets rid of it.

greenteas

system messages  (after doing the Task)
moderator messages (your thread was moved to the section
manage work
Friends interaction
Why you dont clic on it ????

Caro1970

Yes it appears when you have been in the friend interactions.
Except when there are still other notices,then you wont see it.

Caro1970

Why minus 5? I think you send 5 messages in the friend interactions.