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src/04-markup/04-parsing_02.md

@@ -114,7 +114,7 @@ by passing the flag `-Wall` to `ghc` or `runghc`.
 **My recommendation is to always use `-Wall`**!
 
 > As an aside, while it is possible to use pattern matching in function definitions by defining a function
-> multiple times, [I personally don't like that feature very much](https://fosstodon.org/@suppi/110360105149103689)
+> multiple times, [I personally don't like that feature very much](https://web.archive.org/web/20200509003311/https://twitter.com/_gilmi/status/1257225601079029760)
 > and I would encourage you to avoid it,
 > but if you want to use it instead of case expressions, it is possible.
 

src/10-recap.md

@@ -35,7 +35,7 @@ Thank you for reading this book. I hope you enjoyed it and found Haskell interes
 I would very much like to hear your feedback. If you'd like, you could leave your
 feedback on this book's
 [discussion board](https://github.com/soupi/learn-haskell-blog-generator/discussions),
-or you could reach me directly on [mastodon](https://fosstodon.org/@suppi) or via email.
+or you could reach me via email.
 You can find my contact information [on my website](https://gilmi.me).
 
 If you liked this book, do let me know - your kind words mean a lot.