Elon Musk, CEO of Tesla Motors Inc., introduces the Model X car at the company's headquarters Tuesday, Sept. 29, 2015, in Fremont, Calif. Musk may want to send tweet back to the birds, but the ubiquitous term for posting on the site he now calls X is here to stay, at least for now. For one, the word is still plastered all over the website formerly known as Twitter. Write a post, you still need to press a blue button that says tweet to publish it. To repost it, you still tap retweet. (AP Photo/Marcio Jose Sanchez) **FILE**
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