So everything up until now was Sacca on his best behavior, not speaking his mind?

For nine years, Sacca says,  “I never expressed any frustration or disappointment at missed opportunities or any exasperation at what wasn’t happening.'' But even though he's no longer an official adviser to Twitter, Sacca says he has “strong opinions'' about Twitter.  “Frankly, who doesn’t? I yearn to know where this company is headed. Having been one of the first 140 users, I have seen multiple eras of the product.”  

Twitter, which became a public company in November 2013, is dealing with slowing user growth and sales. The product is awaiting improvements that may take a while to drum up a larger audience, if they do at all, and the ad sales team is finding that a strategy that worked for more than four years is in need of change.

Revenue missed estimates in the first quarter, and the company scaled back expectations for the current period and this year. Growth is slowing as Twitter’s share of the $145 billion digital-ad market was stuck below 1 percent last year, compared with 31 percent for Google Inc. and 7.9 percent for Facebook Inc., according to EMarketer Inc.  And growth of the member base has also continued to slow, reaching 302 million monthly users in the first quarter -- about a fifth of Facebook's audience.