Though Fail_FandomAnon is about fails and fandom, there are certain threads that pop up all the time, usually at least once a post. Which threads are common has, naturally, changed with the passage of time.

• Things You Wouldn't Admit Unanon
• Unpopular Opinions
• Fandom/Non-fandom/Random Venting
• Foreign-language threads, especially by the Scandanonnies
• Things Making You Sad/Happy/Annoyed Right Now
• Books threads
• Cooking/food threads
• Makeup/beauty threads
• Sports threads
• Politics and Current Events threads (including UK Politics, which is forbidden outside that thread; US Politics, which is sometimes outright banished to its own post; and Moon Politics, which is a parody of all of the above)
• Various types of rec threads, especially Fic Recs (see also Academic)
• “Ask Me Anything”
• Fic Research/Unfuck My Plot threads
• Tumblr and Twitter wank threads (sometimes merged with Reddit Rubbernecking to form a consolidated Social Media thread)
• Discussion threads for various genres and canons (anime, comics, movies, etc.)

• “3-5 Lines (of something you've written)”
• 100 Words
• Memefic/Origfic discussion
• Publishing
• Smut Writers' Support Group
• WIPs

These threads tend to pop up when the post approaches the comment limit (6500 as of this writing, formerly less).

• EFW threads, although some nonnies detest them
• Game threads (including Botticelli, Minister's Cat, etc)

Some once-common threads have faded into obscurity… for now.

• Things You'd Like to Say to Your F-List/to an F-Lister (a/k/a “Dear F-Lister” or “Dear Fandom Friend”)