When I logged into Facebook tonight, this was at the top of my wall. Does anyone know why I was presented with this? I asked several friends but none of them saw this on their walls. Nothing happened if you clicked on it and no other text was presented with it.
At the time, when I logged in, I was using Firefox on Arch Linux. I have never seen messages like this before nor am I continuing to see this message.
We're happy you're here and hope you enjoy Facebook tonight
UPDATE
This definitely seems to have something to do with October. I got that one on October 1st and, and today, the last day of October I received another similar one when I logged into my phone.
Best Answer
Facebook is constantly experimenting with stuff. This is probably just another of their experiments.
There was a lot of talk a few months ago about how Facebook was looking for ways for people to nudge people into posting more positive things to their timelines. I expect this was just something they were trying out. In other words, show this to a few hundred thousand random people and see if what they post that day is more "positive" than people who didn't get the message.