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Twitter's founders reunite in advance of expected IPO filing

All signs point to the social-networking giant filing its S-1 tomorrow, though nothing is yet known for sure about the company's plans.

The stars seem to be aligning for Twitter to announce, within a day or two, that it has filed its S-1, the formal registration that it plans on going public.

Though not much is known for certain about Twitter's plans, its initial public offering is the most anticipated in the tech industry since Facebook went public last year. Earlier this month, Twitter said it had already started the process with a "confidential" IPO filing with the Securities and Exchange Commission. All Things Digital later reported that the filing had actually taken place in July.

On Thursday, three of Twitter's four co-founders, Jack Dorsey, Evan Williams, and Biz Stone, appeared at the company's headquarters during a staff meeting that was referred to as "tea time."

No reporters were invited to the meeting, so not much is known about what the three co-founders said. But it would make sense that the three would speak about the company's IPO plans, though none of them are currently active in the company's day-to-day management. Dorsey, who is CEO of mobile payments company Square, is still Twitter's executive chairman. Both he and Williams are former CEOs of Twitter.

According to reports from Fox Business, Fortune, and GigaOm, the filing is likely to be made tomorrow. Stay tuned for CNET's coverage of the filing, and what it means for Twitter, it users, advertisers, and competitors.