<p>Saying goodbye in 140 characters or less: Twitter's chief executive bows out after five years on the job, in the face of disappointing financial results and weak user growth. Also today: Greece suffers another setback as the IMF withdraws from bailout talks, and Zimbabwe's national bank bids farewell to its local currency. </p><br /><br />Visit our website:<br />http://www.france24.com<br /><br />Like us on Facebook:<br />https://www.facebook.com/FRANCE24.English<br /><br />Follow us on Twitter:<br />https://twitter.com/France24_en
