Opendoor's top cheerleader may be moving on.Shares of Opendoor Technologies (OPEN -12.80%) were pulling back today, letting a little air out of the meme stock rally.While there wasn't any company-specific news out on Opendoor, there were two news items that may have weighed on the already-volatile stock.As a result, Opendoor closed down more than 12%. Opendoor pulls backThe biggest factor impacting Opendoor today may have been a post on X from hedge fund manager Eric Jackson, who started the meme stock-base ...