It's official: Twitter has filed an IPO

After several years in the making (and months of countless rumors), Twitter is officially going forward with an initial public offering.

Naturally, the micro-blogging giant went public with the news about going public via a single Tweet.

We’ve confidentially submitted an S-1 to the SEC for a planned IPO. This Tweet does not constitute an offer of any securities for sale.

— Twitter (@twitter) September 12, 2013

It's been a big week concerning news about both Twitter and tech IPOs.

Earlier this week, Twitter announced it was buying MoPub, a mobile-focused advertising exchange self touted to be the "world's largest mobile ad server."

That merger should help strengthen Twitter's mobile advertising revenue stream as it looks to entice investors leading up to a stock exchange debut.

Additional resources and talent on the mobile ads side should also help compliment Twitter's growing strength in tapping into convergence of social media and TV.

As far as tech IPOs are concerned, just this morning global consulting firm PriceWaterhousecoopers released its second quarter report surveying the industry's private-turned-public businesses.

The outlook was very optimistic for the tech space in the United States especially -- a sharp contrast to what the sentiments were in Silicon Valley at this time last year.

While enterprise business debuts from the likes of Workday and Marin Software fared better, consumer ones inspired nervousness and fear in analysts, investors, and end users alike.

Facebook was the unfortunate poster child of this phase. The world's largest social network's founder and CEO Mark Zuckerberg made his first public appearance following the disastrous debut on the Nasdaq at TechCrunch Disrupt in September 2012.

Fast forward to 12 months later and Facebook shares continue to soar well above the IPO price.

At his follow-up appearance at the annual startup-heavy summit on Wednesday, Zuckerberg quipped (likely in reference to rumors surrounding a Twitter IPO) that he was the last person that anyone should look to for IPO tips.

At the time this post was published on Thursday afternoon, Twitter's S-1 filing still wasn't live yet on the homepage of the U.S. Securities and Exchange Commission.

According to SEC rules, if a private company is valued at less than $1 billion in revenue, it can file confidentially and keep financials a secret until the IPO roadshow.

Twitter simply followed up with this Twitpic and Tweet -- far less than the 140-character maximum that started it all:

Now, back to work. pic.twitter.com/e4lK8e7pY9

— Twitter (@twitter) September 12, 2013