When Elon Musk was accused earlier this year of violating a months-old agreement that he clear material tweets about Tesla Inc. with a company lawyer, the billionaire told a federal judge he took his accord with the Securities and Exchange Commission seriously, and that he had dramatically reduced his postings about the electric-car maker. Then, he went back on a binge. Musk sent more Tesla-related tweets in March than any month since June, according to a Bloomberg News analysis of his activity on the social network. He began the month trying to placate customers irritated by price changes for Autopilot, Tesla's driver-assistance system, and ended it with posts about the Semi truck he's eager for Tesla to start producing.