Yet another top Twitter executive, Chloe Sladden, head of media at the micro-bloggin site, said she will be leaving the company in a series of tweets posted Thursday night.

The news follows the departure of Twitter COO Ali Rowghani following a dispute with CEO Dick Costolo, in an ongoing management shake-up at the company.

Sladden developed partnerships with news organizations for Twitter, helping it connect traditional media to new media. She also had a major role in making Twitter a large part of the lsocial TV phenomenon. “Now it’s time for my next chapter,” she tweeted Thursday evening.

Lindsay Schauer, senior manager of Twitter’s internal communications, also said she was leaving the company, Friday.