BuzzFeed has given up on going public for now and Mashable is looking for an emergency buyer. The honeymoon period looks to be over for online news websites, left fragile by a model built almost entirely on advertising.

Less than two years ago, blog turned news site Mashable was valued at $250 million, with Time Warner among its investors.

Today, its value has plummeted by 80 per cent, and it's reportedly about to be sold to Ziff Davis. The publisher did not respond to requests for comment.

Meanwhile, revenues that fell short of expectations at BuzzFeed, built on a combination of pop culture and social networks, mean it is no longer expected to go public next year.

The website has just announced it is letting go of around 100 of its 1,700 employees.

These sites, like others founded in the last 10 years, promised investors huge growth driven by advertising as traditional media battled for survival.

But in the space of a few months, the tide has turned, as Google and Facebook's chokehold on the online advertising market reaches a critical point.

In 2017, the two internet giants have snapped up 63 per cent of advertising revenue, compared to 58 per cent last year, according to market researcher eMarketer. Next year, they are projected to rake in a 67 per cent share.

“Advertisers are increasingly demanding more granularity in targeting capabilities to reach consumers,” Monica Peart, eMarketer's senior director of forecasting, said in late September.

“Google and Facebook have positioned themselves at the front of this demand curve.”

'It's not magic'

“It's not magic,” said Alan Mutter, a professor at the University of California Berkeley specialising the relationship between journalism and technology.

“Web publishers can publish an unlimited number of pages and get an unlimited number of page views but there's only a limited number of people buying advertising.”

In this standoff with the two Californian behemoths, it's new players who stack up the disadvantages, as two-thirds of their traffic comes from social networks and search engines, mostly controlled by Facebook and Google.

According to Mutter, “if you're spending money on creating content, you're competing with the masters of the internet who spend nothing” on producing content.

But despite the brutal reality, few believe these new media will collapse completely, like the internet bubble of the early 2000s.

It may be 20 per cent lower than projected, but with revenue of $280 million according to the United States' (US) media, BuzzFeed is still set to end the year with growth.

For Charlie O'Donnell, founder of seed stage investment fund Brooklyn Bridge Ventures, a website financed entirely by advertising is “still viable.”

“But is it viable to the tune of a billion-dollar exit? That's tough,” he said.

Promised returns on investment and plans to enter the stock market are likely nothing but memories now, except for Vice, the only organisation that has reached a viable scale.

Without reaching such a size, success requires building an audience around a specialised subject and consequently attracting advertisers, as seen with Politico, Eater and technology site The Verge.

But for those starting out today, prospects for success are limited.

“I would have to hear a very compelling story that you're going to serve some new vertical that nobody ever thought of before,” former journalist Mutter said of investing in a new venture.

“I don't know what that would be. This is very hard to do.”