It got the most likes (468) and by far the most comments (60). A couple of livejournal posts also got more than 30 comments: my visiting professorship, and my line on the Hugos (since they are friends-locked I can't embed them).
The second most likes (381) went to what was also the most widely shared post of my own content, this comment on the Irish marriage equality referendum, also in May. Of the 65 shares, I can see only 38, so it travelled further than I had dared hope.
The most liked post of someone else's content was, to give them due credit, this philosophical reflection from the letter column of the Telegraph, which picked up 300 likes, once again in May:
Finally, my Christmas Day photo of our three teenage offspring, though friends-locked, got a gratifying number of likes (236 at last count).
Facebook has basically become the default path for online engagement in my wider social and family circle. But for how much longer, I wonder?