That collection of abstractions bound together by a mental model* that we usually refer to as "Making Light" has got back-end troubles. Although it does not reflect the underlying reality, feel free to think of it as the result of an enormous office party by the comment approval gnomes. That's much more entertaining than "too many connections".
The upshot is that you must treat what already sits on the site as a perfect jewel. Feel free to admire it, but you may not at this point add to it. Commenting is broken.
A support ticket has been raised with the host, but until we get this fixed, feel free to chat here.
Further bulletins as events warrant. The final update will mention a murnival.
Further Bulletin One:
The error message all the cool kids are getting has moved from "too many connections" to "Can't call method "created_on" on an undefined value."
* Or rather, a coalescence of multiple mental models which mostly† manage to intersect into a single consensus reality‡. I would never expect that anyone else's mental model is any more than functionally equivalent to mine.
†in this context, possessing an outlying model is symptomatic of trolldom.
‡ I can't believe I just used "reality" as a synonym for the internet.