It depends on the medium - SO is closer to a wiki of questions, and Wikipedia has similar rules against pleasantries or signatures on article pages. (They do allow it on "talk" pages, and SO similarly has less restrictive rules in places other than their primary questions and answers.)
It depends on the medium - SO is closer to a wiki of questions, and Wikipedia has similar rules against pleasantries or signatures on article pages. (They do allow it on "talk" pages, and SO similarly has less restrictive rules in places other than their primary questions and answers.)