Palantir Technologies is trading higher Thursday morning on above-average volume amid increased retail investor interest in the stock on social media.The average session volume is about 42 million over a 100-day period. Palantir's daily trading volume was already approaching 30 million less than an hour into trading Thursday.Palantir was one the top two trending stocks on Stocktwits at publication time. The stock was among the top five most mentioned stocks on the subreddit r/wallstreetbets over