I've noticed that a lot of submissions have had their titles changed recently (past month or two). I wasn't aware that users were allowed to change their own ti

I've noticed that a lot of submissions have had their titles changed recently (past month or two). I wasn't aware that users were allowed to change their own titles - I was chalking this up to moderators "curating" articles. How often do users change the titles of their submissions? There's no way to tell.