The Block NZ: Twins Ali and Julia sent home to recover from social media bullying

Mark Richardson staged an intervention on The Block NZ last night, ordering twins Ali and Julia off-site to go and spend time with people they love.

"Go and see someone you love, go and see someone whose opinion matters to you and get completely away from this environment," Richardson told the pair at the end of last night's episode.

The pair, who have been actively portrayed as the villains of this season's Block, have become regular targets of online abuse, particularly on The Block NZ's official Facebook page.

But after a 24-hour community challenge, in which the teams were assigned jobs to help their neighbours, the twins' spirits appeared broken.

After returning to The Block, the pair went MIA for a day, leaving site foreman Peter Wolfkamp unable to contact them.

The following morning, the twins were back on site, when Richardson approached them to raise his concerns.

"How you guys are at the moment, is concerning me," he told them.

"I think emotionally you guys are struggling. You've been getting an absolute pounding social-media wise. You guys are struggling, you have to admit over the past couple of weeks, it's really ground you down."

He then continued: "I think if you continue in this state, you won't get the house finished to the standard that I want, you want and I think the market will want. What I feel is best for you guys is if you just flag this week.

"It's not an option. It's non-negotiable," he told them.

The pair are the first team in Block NZ history to be ordered off-site.

A teaser for Sunday night's episode showed the remaining three teams gather for judging at the Challenge Warehouse - and no sign of the twins.

In a statement, a MediaWorks spokesperson confirmed The Block Facebook page is moderated.

"We have an important duty of care responsibility to our contestants across all Three reality shows. It was acknowledged during last night's episode that there has been a significant amount of negativity on social media directed towards Julia and Ali in recent weeks and combined with the stress of participating on the show, we decided that it was necessary for them to have some time off. The Block NZ and associated Facebook pages are moderated and comments that are abusive, offensive or aggressive are removed."