Will this affect the price of Bitcoin? Most likely, yes. But I doubt Facebook will announce it.
It looks like it was a false alarm. But still it may indicate that Facebook plans to do so. I really love to see it as we saw its effect on the price when Tesla announced their huge investment into Bitcoin. I actually don't like the price's being manipulated easily. But we have nothing to do about it. So we hope to see it in a positive way.