SpaceX brings Musk back on Twitter, days after quitting

(Reuters) - Elon Musk has not left Twitter after all.Just three days after the billionaire announced that he was going offline, Tesla Inc's chief executive officer went back on Tuesday with a handful of tweets promoting a successful test by his rocket company, SpaceX."Great work by SpaceX Dragon team & Airborne! To be clear, we’ve only done 1 multi-parachute test of Mk3 design, so 9 more left to reach 10 successful tests in a row," he tweeted. (http://bit.ly/33iaHDr)Last Friday, Musk tweeted..