Kramer joined the micro-blogging platform as , charged with building the brand and increasing its global user base.
It is not known whether she has a job to go to.
Twitter co-founders of the business to work on new projects.
In the UK, Tw as it continues its rollout of its UK-targeted ad products. It currently has a team of seven, lead by Tony Wang.
Twitter declined to comment on the reports.
Last week Wang hosted a dinner for his boss, CEO Dick Costolo, who was visiting the UK. Dubbed
The departure of Kramer follows that Sean Garrett. The Twitter VP of communications left the company without a job to go to last week.
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