In Shenwick v. Twitter, Inc., No. 16-cv-05314-IST, (N.D. California, Feb. 7, 2018), a securities class action filed on behalf of certain persons who bought or acquired common stock of Twitter, Inc. (“Twitter”) in 2015, the magistrate judge resolved several ESI-related discovery disputes. First, the parties disagreed regarding the scope of custodians. The parties agreed that