Retail traders on Stocktwits were buzzing, with some skeptical that the huge gains could continue. Newsmax saw its market cap soar to $20 billion Tuesday.

SOPA Images / Contributor, NurPhoto / Contributor / Getty Images The stock market is in the thick of another meme stock frenzy, sparked by Sunday night's online return of one of the key figures ...

A wave of retail investors is shaking up European markets, echoing the meme stock frenzy that hit ... have soared, driven partly by social media-fueled buying aimed at pressuring hedge funds ...