Following up on a recent discussion in comments...
Does the community approve of linked puzzles?
Linked puzzles can come in at least two varieties.
One user posts a puzzle of a certain type, which inspires other users to post more puzzles in the same genre (e.g. the recent Four-words, Five-words, Six-words, etc. sequence and the infamous Security to the Party sequence)
One user posts a sequence of puzzles which can be linked together to form a longer narrative, each one following on from the events of the last (e.g. the Murder of the President series, the SErial Killer series, the Slumdog Millionaire series, and the Mysterious email miniseries - in each case I've linked only the first puzzle in the series, but you can see the others in the "related puzzles" list on the right). This type of linked puzzle itself comes in two varieties:
the puzzles in the series are related, and the solution to one is helpful or even vital in solving the next (I believe the Murder of the President and SErial Killer series fall under this header)
the puzzles in the series are related only in that they involve the same people or are set in the same context, and each one can be solved independently of the rest (the Slumdog Millionaire and Mysterious email series fall under this header).
One user posts a puzzle which takes such a long time to be solved that they then post a new puzzle whose answer is a hint to the first one. I can only think of one example of this happening.
Do you think none, some, or all of these types of puzzle are acceptable/valuable/should be encouraged?
(I've done my best to make this post unbiased. I'll post my own opinions on the topic as an answer. If anyone can think of a kind of linked puzzle not covered by the above, feel free to edit the question.)