After further inspection, it appears all the tweets had been sending out viaTwitter Counter.
Twitter Counter had confirmed that their service experienced a breach and they reacted immediately to block the attack.
Most of the tweets are removed.

However, Engadget managed to take a screenshot of the link posted via the @playstation account.
We have launched an investigation into this matter.
As of now, the hackers CANNOT post on our users behalf anymore.

We will keep you posted on any other updates!
We can confirm that our service has been hacked; allowing posts on behalf of our users!
We have launched an investigation into this matter.

We will keep you posted on any other updates!
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