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Explain xkcd: It's 'cause you're dumb.
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Since the current Twitter threadfall kicked off in early 2016, we can expect it to continue until the mid-2060s when the next Interval begins.
Title text: Since the current Twitter threadfall kicked off in early 2016, we can expect it to continue until the mid-2060s when the next Interval begins.


Ambox notice.png This explanation may be incomplete or incorrect: Needs more. Do not delete this tag before the explanation is actually complete.

F'nor is a character from the popular sci-fi/fantasy series "Dragonriders of Pern," by Anne McCaffrey. He is posting a Twitter comment (a "thread" that's only one comment long, hence "1/1") about "Thread," a massively destructive alien organism from the same series. "Pern" is a fictional human-colonized planet and the main setting of the series.

Typically, when starting a series of tweets (used to have content longer than 140 characters), one will start the first tweet with "Thread: " and end it with 1/X. The second tweet will read 2/X, and so on. If X, the total number of tweets, is unknown at the start, it will be listed or 1/many or omitted: 1/

Here, there is a play on the Twitter thread and the actual threat to Pern.

"Threadfall" is the name for the beginning of 50-year cyclic periods when Thread attacks the world of Pern & its inhabitants, which occur between relatively safe "Intervals" of around 200 years. In the strip's alt text, as Threadfall occurred in 2016, it should be expected to continue for ~50 more years until 2060, when the next Interval will begin.


Ambox notice.png This transcript is incomplete. Please help editing it! Thanks.
[A mock-up of a "tweet" from the site is shown. It contains a mock-up of a user photo of the fictional character F'nor resembling Hairy, including a tiny line sketch of F'nor's brown dragon Canth flying overhead. Below the tweet are several action buttons typical of a twitter post for comments, replying, likes, etc.]
Thread: The greatest threat to our life on Pern 1/1


On Friday, the header was replaced with a message from Randall about how he would be visiting the U.K. on the following week. It read as follows:

 I'll be visiting the UK next week! You can join me in London from September 30-October 2 (at New Scientist Live, The Royal Institution, and Intelligence Squared), then from October 3-6 in York, Edinburgh, Cambridge and Ely, Oxford, and Cheltenham.

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