Gable Tostee is on bail after Wright fell to her death from his Gold Coast balcony and has been warned off online activity by a judge.
But he responded to a request for advice on how to connect with an older woman by advising the man to write: "I can do things to you that will make you feel 21."
Tostee is awaiting trial after the death of Wright in August last year. He had met the New Zealand woman hours earlier through online dating app Tinder.
It's not the first time he has used his time on bail to make inflammatory online comments. In December, he posted a lengthy statement to the same bodybuilding website in which he proclaimed his innocence.
His latest online outburst comes as a teenager in New Zealand accused of murder has also gone online to defend himself.
Beauen Daniel George Wallace-Loretz, 17, is jointly accused with Leonard Nattrass-Berquist of murdering Ihaia Gillman-Harris on December 27 at the Ascot Epsom Motel.
The pair, who are also accused of robbing Gillman-Harris of cash, a cell phone and bank card, and taking his $15,000 Range Rover, were released from custody on electronically monitored bail two weeks ago.
This week Wallace-Loretz wrote on Facebook that those critical of him "dont know me and you dont [know] my homie lenny".
"To every[one] asking me wanting to know the truth and what happened id love to tell everyone, but i need [to] sort it first the coppers [police] are twisting every [thing]".
Although the cases are in different countries, Sensible Sentencing Trust founder Garth McVicar said they reflected implications of the digital age - and that judges were out of touch.
He was surprised judges weren't doing more to prevent defendants from accessing the internet.
"If the judges ... aren't realising what these offenders are getting up to on electronic bail then that's quite alarming.
"The judges need to bring themselves up to speed ... it needs to be written into bail conditions."
The online world was how young people communicated, McVicar said.
"Maybe we're dealing with some judges who are totally out of touch, that's disappointing if that's the case."
