If someone wants to do a useful and doable Web application in Racket...
You could make threaded discussion Web forum (or email) software.
(Implementation suggestions... Use Racket `db` interface, and deploy in
PostgreSQL by default. Consider storing each threaded comment in its
own row (with IDs for things like parent comment), and keeping a cache
representation of each threaded topic as a blob in a separate
table/memory/file, so save you from some nasty querying every time you
want to show someone the topic. The cache for each topic can be
s-expression/objects (which lets you someday apply user-specific
personalization on the server before sending), HTML that's later pasted
into a page (traditional), or (less-traditional-Web-friendly, but
more-Webservice-friendly) JSON that's then turned into DOM/HTML by JS on
the client. You might have multiple caches per topic, such as for
different sorting criteria, if that's a thing.)
After the basic threaded Web forum is done, you can make an email
gateway/notifications for it, and/or RSS/Atom, to keep people engaged
rather than them having to keep monitoring and going to a Web site.
There's also a dogfooding aspect. A basic threaded Web forum should be
able to be doable enough in Racket to be suitable for a book example
project, and maybe a tutorial.
An alternative to the above would be to reverse the priorities, and the
order in which you build it: make a discussion email server that mirrors
to a Web archive/reader (and maybe the Web archive permits posting
comments).
Bonus: Racketeers will get warm-fuzzies from using something homegrown
in Racket (compared to feverish indigestion, from having to use certain
other things).
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