Since Lifelog was exposed and "shutdown" what is darpa up to now with social media you ask?

https://www.darpa.mil/program/social-media-in-strategic-communication

SMISC researchers will create a closed and controlled environment where large amounts of data are collected, with experiments performed in support of development and testing. One example of such an environment might be a closed social media network of 2,000 to 5,000 people who have agreed to conduct social media-based activities in this network and agree to participate in required data collection and experiments. This network might be formed within a single organization, or span several. Another example might be a role-player game where use of social media is central to that game and where players have again agreed to participate in data collection and experiments.