Announcing his presidential candidacy Wednesday, Gov. Bobby Jindal posted a video, that appears to be shot from a tree, of him and his wife telling their children he's decided to run.
By clicking "Like" and commenting on Facebook posts, users signal the social network's algorithm that they care about something. That in turn helps influence what they see later. Algorithms like that happen all over the web — and the programs can reflect human biases.
A quick staff-up and a fast-paced money grab are common to both startups and campaigns. Here, staffers work at computers during a tour of President Obama's re-election headquarters in Chicago on May 12, 2010.
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