Anonymous B joined in and replied with this 6 years ago, 40 minutes later[^][v]#1,069,737
It is used with letters who don't necessarily identify as letters. It's to signify that the letter is open to maybe being a note, a memo, an epistle, a missive, a dispatch, or something else. I don't think we need to impose labels on letters until they are ready to accept them for themselves.
Anonymous A (OP) replied with this 6 years ago, 5 minutes later, 46 minutes after the original post[^][v]#1,069,740
Meta !Sober//iZs joined in and replied with this 6 years ago, 27 minutes later, 1 hour after the original post[^][v]#1,069,751
I always thought they were kind of a shitty thing to do. If you have a quarrel with someone, you should resolve it directly. Broadcasting it out for everyone to see is just gay.
tteh !GETFUCKED joined in and replied with this 6 years ago, 27 minutes later, 1 hour after the original post[^][v]#1,069,756
The envelope has been opened.
Peter joined in and replied with this 6 years ago, 1 hour later, 2 hours after the original post[^][v]#1,069,765