A best man's prank turned out to be an embarrassing internet extravaganza for a newlywed couple, after intimate details of them conceiving a baby were Tweeted live from their bedroom.

While the prank resulted in possibly the first-ever conception recorded on Twitter, the parents-to-be may never know thousands were watching.

The best man had allegedly created the Twitter account @newslywedsontjob to send live tweets every time the couple got active in the bedroom.

"You'll know when it starts, when it ends, the force, a rating on the frenzy index and a judge's comment - all broadcast live to Twitter," News.com.au quoted the man as saying on the twitter page.

"(My best friend) stitched me up something rotten when he was my best man so I reckon this is reasonable payback," he added.

The best man, inspired by another project that tweeted a co-worker's flatulence, says he hooked up the bed with motion-sensing and pressure-sensitive technology for extra details.

On the first night back from their honeymoon in December, the newlyweds apparently had no idea there was an online audience.

"They're on the job! #2 - Action commenced at 15.50GMT. Weight: 51KG," the first bed tweet said.

Over three months, the couple recorded frenzy indexes from 2, through to 10. They frequently recorded levels of 8 or 9, and on average the bed tweeted sessions lasting 19 minutes every 3 days.

In an interview with men's wedding website iamstaggered.com, the best man said that he planned to reveal all to his friend in February.

But his friend gave him the big news that his wife was about nine weeks pregnant.

Now, the prankster has said that he realised the conception was likely to have been tweeted and decided to dismantle the setup without telling his best mate.

"Its one thing to have a joke on him. But I'm not sure how he'd react if I told him that I'd made it so twenty-odd thousand people could watch him make a baby," he told the website.

Calculations indicate the baby will be due in late September. (ANI)