Elon Musk, the CEO of Tesla and SpaceX, has resumed tweeting about the meme Cryptocurrency Dogecoin. He updated his Twitter profile picture to incorporate a Shiba Inu dog representing Dogecoin. He further added that his son is "hodling his Doge like a champ." In the meantime, Dogecoin's trading volumes soared 1,250% in the second quarter on the world's major Cryptocurrency exchanges.