Many people were surprised when Facebook agreed to acquire WhatsApp for $19 billion in February, despite the fact it had virtually no revenue.

Some people were surprised when Twitter's market cap surged above $30 billion after its IPO, despite the fact it wasn't profitable.

But at least those companies actually had staff, users and, you know, a functional business. The latest tech company to join the billion-dollar club can't even say that.

See also: How the Tech IPOs of 2014 Have Fared So Far

Cynk Technology Corp made headlines after its stock went from worthless (about $0.10 a share) to nearly $15 a share in a matter of weeks, an unfathomable gain of more than 20,000%. On Thursday, the stock shot up even more despite — or perhaps because of — press coverage, topping $20 a share at one point and giving the company a market cap as high as $6 billion.

If you haven't heard of Cynk before, you're not alone. Cynk, originally called Introbiz, was founded in 2008 and touted itself as a social network to let users "pay to get in touch with people you know." As it explained in an SEC filing, "money or donations act as a convenient reason to get in touch with people who can benefit your career or enhance one’s life."

CYNK data by YCharts

Cynk somehow managed to raise just more than $60,000 by issuing stock, according to BuzzFeed, but it failed to generate any revenue during the 2011-2013 fiscal years and accumulated a net loss of $1.5 million from the time of its founding in 2008.

"The Company has not yet emerged from its development stage, has not established an ongoing source of revenues sufficient to cover its operating cost, and requires additional capital to commence its operating plan," according to a Cynk filing in November. "The ability of the Company to continue as a going concern is dependent on the Company obtaining adequate capital to fund operating losses until it becomes profitable."

In that same filing with the SEC, Cynk said it had no assets to report.

To make matters even more bizarre, Cynk appears to have just one employee: Marlon Luis Sanchez, who is described in a March filing as being the company's president, CEO, CFO, chief accounting officer, treasurer and director. We'd say he deserves a raise for all that, but remember, the company doesn't actually make any money.

Introbiz, the company's social networking site, does still exist online — as pointed out by Business Insider — but certain key things like the terms of use section are just left blank. Indeed, the website doesn't even have enough monthly visitors to factor into Alexa's traffic rankings.

So how did a company with a barely functioning website, no real staff to speak of and no revenue suddenly surge so much in the stock market? That's the $6 billion question.

It's unfortunately common enough for investors to try to make a quick profit by buying and selling penny stocks like Cynk. It's unclear whether someone inside or outside the company is trying to pump and dump the stock. One report last month in SeekingAlpha pointed to what appeared to be a coordinated effort of Twitter accounts touting the stock's performance.

Image: Screengrab, Topsy

"Who knows if insiders are trying to pump it to a high price?" Peter Messineo, the last auditor of Cynk, told CNBC in an interview on Thursday. "All I know is that I disassociate from this."

The Securities and Exchange Commission declined to comment on the matter. FINRA, the largest independent securities regulator, is reportedly looking into the situation.