What’s the purpose of starting a blog post like that? The phrase is a cliché, and not a polite one. Whatever follows that introduction is either something the reader already knows and has fresh in memory (thus useless to mention) or you’re calling them oblivious.
A sentence that’s irrelevant or mocking the reader seems like a poor way to start an essay.
Most of us would do well to “hide under a rock” for a while. News and the way they are presented to us are stressful and largely irrelevant. Chances are you could live the rest of your life without knowing Twitter was hacked.