SAN FRANCISCO – If Lady Gaga were to send a message to her 40 million Twitter followers summarizing the company's debut on Wall Street, it might very well say: "Twitter IPO. Mobile. Born This Way."
Twitter, which was built on messages so short that they could be texted on a cellphone, revealed Thursday just how central smartphones and tablets are to its business — underscoring the technology industry's rapid transition to a mobile world.
But despite clear evidence that it is quickly increasing its revenue from mobile advertising, the company also disclosed that it had not yet turned a profit, that it had been steadily losing money and that its user growth had been slowing significantly since the end of last year.
Last month, the company announced that it would go public but had filed confidential papers. On Thursday, it made its prospectus public, providing a first glimpse at its financial health.
The Twitter initial public offering — the most hotly anticipated stock sale since Facebook's last year — will make early employees and investors in the company very rich.
Evan Williams, one of the company's founders, owns 12 percent of the company, a stake valued at $1.2 billion in August, when the company last priced its employee stock options. Jack Dorsey, another co-founder, owns stock worth about $483 million.
Twitter's impending public offering seizes on the continued growth of social networking and mobile devices, two trends the company has ridden to enormous growth. Founded seven years ago as a side project in a floundering start-up firm, it is now one of the world's biggest public forums, ranking alongside Facebook. Aspects of the service, like hashtags denoting specific discussion topics, have infiltrated popular culture.
The company has turned its deceptively simple product, messages no longer than 140 characters, into a global phenomenon. It has found a way to make money through advertising, notably through sponsored tweets that resemble regular users' posts.