Well, not the first, but the oldest one available.
Other posts that week consisted of:
“Testing for oppo.”
“Is this what Jalopnik/oppo will look like once we get 6.0?”
“Aw man, sideways scrolling for comments. This sucks.”
“Does anyone remember their last post in 5.0?”
“edit. I thought I was commenting on a Gizmodo front page article. Sorry.”