“I acquired well over 1,000 new followers since the beginning of March. So, that’s approximately a 227 per cent increase in just a month,” she said.

While many might delight in such a popularity spike, Gilliss-Chapman, who has previously worked for tech companies to root out spam, was immediately suspicious.

The vast majority of these new accounts contained no identifying photograph and had barely tweeted since their creation.

But they all seemed to be following prominent Twitter users in Cambodia including journalists, business figures, academics and celebrities.

She did some digging and published her findings online, detailing how the vast majority of accounts were recently created in batches by unknown operators who worked hard to hide their real identities.

She wasn’t alone.

Soon prominent Twitter users in Thailand, Vietnam, Myanmar, Sri Lanka and elsewhere noticed the same phenomenon – a surge in follows from anonymous, recently created accounts, adopting local sounding names but barely engaging on the platform, as if lying in wait for someone’s command.

While Facebook has received the lion’s share of international opprobrium in recent months over allegations it has been slow to respond to people and state actors manipulating its platform, Twitter has also faced accusations it has not done enough to rid the platform of fake users.

With elections due in Cambodia, Malaysia, Thailand and Indonesia in the next two years, many hit by the Twitter follow surge in Asia are asking whether the Silicon Valley tech giants are doing enough to stop fake accounts before they are given their marching orders.

So far Twitter has found nothing untoward.

A spokesperson for the company said engineers were “looking into the accounts in question and will take action against any account found to be in violation of the Twitter Rules”.

A source with knowledge of the inquiry said they believe the accounts are “new, organic users” who were probably being suggested prominent Twitter users across Asia to follow when they sign up.

“It’s something we’re keeping an eye on, but for now, it looks like a pretty standard sign-up/onboarding issue,” the source said.

But some are unconvinced by the explanation.

“Are there really this many new, genuine users joining Twitter, all with the same crude hallmarks of fake accounts?” said Raymond Serrato from Democracy Reporting International who has been monitoring the suspicious accounts.

The issue of fake users is hugely sensitive for Twitter because a crackdown could severely dent its roughly 330 million audience – the company’s main selling point.

In a 2014 report to the US Securities and Exchange Commission, Twitter estimated some 5-8.5 per cent of users were bots.

But Emilio Ferrara, a research professor at the University of Southern California, published research last year suggesting it could be double that: 9-15 per cent.

Last week Pew Research Centre released a report analysing 1.2 million English language tweets which contained links to popular websites. Two-thirds of the tweets came from suspected bot accounts.

Twitter Audit Report, a third party company that scans people’s followers using software to estimate how many are fake, suggests as many as 16 million of Donald Trump’s 51 million followers are not real people.

Jennifer Grygiel, an expert on social media at Syracuse University, New York, said the US presidential election has provided a blueprint for others to copy.

“Bad actors around the world have really followed the potential of social media to influence the political process,” she said.

Twitter, she said, is a minnow compared to Facebook’s more than two billion users. But it can still be influential because many prominent opinion formers such as journalists, politicians and academics have a major presence on the platform.

“If you can get information within this population, then you’ve scored,” she said.