Short, to the point.

I don't know when this started, exactly, but I want it known that I do not believe that the word "journal" is meant to be used as a verb.
"Journaling" is what we used to call "keeping a diary."
And don't tell me "diaries are for teenage girls: They're stupid." Tell it to Samuel Pepys, for one. Tell it to the writers who, over the centuries, have kept diaries; tell it to any historical/cultural figure who kept diaries which were eventually published or displayed in archives or museums. These were smart people who did not say, "Oh, I've been journaling a lot lately, it's really cleansing, it really helps me think."
God. Keeping a diary can be, yes, an act of obsession and self-centeredness -- but I'm not calling that a bad thing. It becomes a very bad thing when you call it journaling. So cut it the fuck out.