There must be something in that. Came across two in the last couple of days.
Just like many web-presences, many of these things are hit-or-miss (swung on and missed?), here today gone later today. Some, like this one, are merely suggestions by writers/bloggers with none of the back-and-forth discussion of a real BC.
The Baseball Book Club on Goodreads currently consists of 130 members and describes itself as “A book club for discussion of baseball related books, including major leagues, minor leagues, Japanese league, Negro leagues, EVERYTHING baseball!”
Books we’ve read
SB Nation also has a book club, but I haven’t noticed any recent postings.
Here’s one from Rain of Error.
And, of course, Facebook has one as well.