He's had his day in court and been grilled on camera. Now Gable Tostee has volunteered for yet another interrogation, this time over Facebook.

The exonerated Gold Coast playboy overnight signed up to an online discussion group devoted to his own case, and has begun to answer questions from members.

The impromptu grilling began with Mr Tostee apparently avoiding serious questions about the case, only responding to questions about his record-setting milkshake feat and his favourite soap opera stars.

Photo of Warriena Wright and Gable Tostee taken inside his apartment the night Ms Wright died. Photo / Supplied
Photo of Warriena Wright and Gable Tostee taken inside his apartment the night Ms Wright died. Photo / Supplied

But the man found not guilty of the murder of New Zealand woman Warriena Wright has also begun to engage in discussion around what really happened the night she fell to her death from his Surfers Paradise balcony.

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When asked why he had Ms Wright's mobile phone in his pocket after he left the apartment following her death, Tostee said: "To be honest I don't know".

"Only reason I can think of is that I took it by mistake as I rushed out of the apartment I didn't even realise I had it until later when I was in the car. It was turned in to police later that day and forensically examined for signs of tampering obviously," he wrote.

Mr Tostee was also grilled on what one discussion participant had perceived as a lack of remorse, and hit back hard.

A profile Tostee has been using, under the name Eric Thomas, has participated in discussion on the Facebook group. Photo / Facebook
A profile Tostee has been using, under the name Eric Thomas, has participated in discussion on the Facebook group. Photo / Facebook

"Completely false. I assume you never read my open letter from 2014? Or any of my public posts on Facebook? Or the fact that my lawyers prevented me from reaching out?" he wrote.

"You also need to remember that not everything I do or say is in the context of Warriena's death, which let's not forget I was fully acquitted of."

When asked why he failed to issue an apology during his 60 Minutes interview, he responded: "Apologise for what exactly?"

The arrival of Mr Tostee to the forum, who now goes by the name Eric Thomas and has accordingly changed his Facebook profile, was announced in the closed group which has more than 5000 members.

Established at the beginning of the trial which found Tostee not guilty of murder, the group is an active hotbed speculation and theorising over the high profile case.

The group also received a returning member, Lizzi Evans, who after the trial was revealed to be Mr Tostee's girlfriend.

Lizzi Evans has also been answering questions in the group. Photo / Facebook
Lizzi Evans has also been answering questions in the group. Photo / Facebook

The New Zealand woman had been active in the Facebook group during the trial, posting regular comments defending her lover. She did not at the time identify herself as Mr Tostee's partner, but said a friend of hers was dating him.

Ms Evans has also been posting in the thread specifically established for users to ask questions of the pair.

In one strongly worded response, she clarifies that she didn't meet Mr Tostee on Tinder, and explained that she had been "impulsive".

"As for my behaviour, I am human as are we all and I can be impulsive and quick to jump to the defence of those I care about who can't' have a voice either because it upsets me," she wrote.

"I felt there should be more balance and that things hadn't been reported as they should have, to give people both sides of the coin ... What about the abuse and nastiness (Gable) received? It was no better but that seems to be overlooked."

The pair have brushed off abuse in the forum, but have also been praised by participants for speaking out.

"I take my hat off to you for joining this group considering there has been a lot of negativity toward you," one user wrote.