Thanks for raising this! For now we (mods) have marked this year's posts as "personal blog", so they shouldn't be on the frontpage anymore for most users.

I think, for next year, editing the titles after a day or having a separate section could be good ideas

Dissenting view: like everywhere else on the internet, when you encounter something really crazy you sometimes have to look at the publication date. I trust readers can do that.

The posts do have the “April Fool’s Day” tag right at the beginning?

My first thought was to look at the various contests that have been run, since winning entries in those would be the most likely to have high impact. Not a contest exactly, but the most obvious starting place is the First Decade review, and I don’t know whether I see large changes to EA that reflect those posts. Many of them are not prescriptive posts anyway, but rather descriptive posts that captured something important.

When Open Philanthropy ran its Cause Exploration Prizes, two of the winning posts jumped out at me; on organophosphate pesticides, and violence against women and girls. The latter seems to have led The Life You Can Save to add a fund for the cause, which is a pretty large impact. I don’t have any information about the former, but the author now works at OP, and OP also launched a cause area in global public health policy that would clearly cover organophosphate pesticides, so I would speculate that that post was very influential to them.

The EA criticism and red-teaming contest had some entries that were specific to organizations, that plausibly had effects, but I wouldn’t be in a position to observe those, so I don’t know. Similarly with GiveWell’s Change our Mind contest, I’m sure those posts have had some impact, but the only one that GiveWell explicitly acknowledged was this one on deworming.

Thanks for giving feedback! I looked at this particular quick take again before April Fool's to make sure we'd fixed the issue. Thanks to @JP Addison🔸 for writing the code to make the tags visible.