Surely, YC knows whether this is true or not :)

But in all seriousness, shouldn't it just say the original title - "YouTube to Acquire Videogame-Streaming Service Twitch for $1 Billion: Sources". The Sources implying it's not publically confirmed, right?

That headline still seems overstated given that other stories are contradicting it.

I suppose I should mention that I have zero information about this, other than what's appeared on HN.

Fair enough - I've just seen the contradicting stories as well. Would this fall under sensationalist or link-bait then?

I'm not sure. A lot of this is guesswork.