This is a new pet peeve for me, as I just now realized that it's been bugging me consistently enough to qualify.
Blog posts that begin with, "It Begins:".
Regardless of the blog or author, rarely does the body of the post denote the literal beginning of anything. The attempt is to signify that somehow with that particular blog post, there is a demarcation between events occurring before the blog post and after it, and that from that point forward everything is different and will continue in a trajectory set by the subject of the blog post.
And lest anyone do an exhaustive search, I've probably been guilty of it somewhere along the line, so I'll preemptively admit it even though I don't specifically recall doing it.