Early this morning, I got up, made some coffee, sat down at my desk, and opened Twitter to read the news and pass some time before I had to leave for a conference. One of the first things I saw in my timeline was a still from a video of what was described in the tweet as an ISIS fighter executing a group of Syrian soldiers. The soldiers lay on their stomachs in the dirt, mostly undressed, hands on their heads. They were arranged in a tightly packed row, arms and legs sometimes overlapping. The apparent killer stood midway down the row, his gun pointed down, smoke coming from its barrel.
That experience led me to this pair of tweets:
If you don’t use Twitter, you probably don’t know that, starting in 2013, Twitter tweaked its software so that photos and other images embedded in tweets would automatically appear in users’ timelines. Before that change, you had to…
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