In the news: Twitter provides some insight into its high-profile hacks last week; Congress has called on Twitter CEO Jack Dorsey to testify along with other tech titans next week; Facebook now lets you livestream your video calls; Elon Musk announced that Tesla will be building its next Gigafactory in Austin, Texas; Plex is now offering 80 free, ad-supported live TV channels; China successfully launched a rocket to Mars, carrying an orbiter, lander, and rover. . . . . . . #twitter #elonmusk #tesla #cybertruck #plexus #china #mars #digitaltrends #dtlive