Michael Reid Roberts has a piece in The American Reader about the grammer employed by Upworthy and other websites to attract clicks:
The key element in these titles is the relationship between the first sentence and the second. The first is relatively traditional, while the second sentence is short, annoyingly informal, and conspiratorial. We might call these couplets epodal because of the relative line lengths, but I think the effect is more similar to catalexis in that the second line’s brevity emphasizes something unfinished or incomplete. The second sentence is intentionally vague: click here to finish the thought, answer the question, solve the riddle! And, like most unfinished stories, the conclusion is rarely satisfying. But as someone who rarely clicks on Upworthy links, I have come to appreciate the beauty of these teases. Read the above titles again, but without registering the hyperlink: now they read like Buddhist koans. You want to know how you might be a war mercenary, but can you know, really? Bask in the not-knowing.