I believe the correct answers are Facebook and Twitter.
Given that he understands the popularity of such social medias and how they can be used for public communications, he did use them quite effectively. He is not the only president to do that, as President Trump is also quite active on Twitter.
<span>A. A club in Harlem for african amercians
</span>
<span>there was gold discovered in California. That's how the gold rush started. James Marshall was working for John Sutter and found gold one day.</span>
