This social media underdog has a lot of growth potential.Reddit's (RDDT -7.18%) stock price has more than quadrupled since it went public eight months ago at $34 per share. The social media company dazzled investors with its rapid growth in users and revenue, and it turned firmly profitable in its latest quarter.But even after those massive gains, Reddit's market cap of $28 billion still makes it a tiny fish in the social media market compared to Meta Platforms (META -0.70%), which is worth $1.4 trillion. C ...