Should it be “SMDB’s MB’s” or “SMDB’s MBs”?
How do MB’ers … er … MBers feel about this?
Prov. 18:2, “The fool takes no pleasure in understanding, but delights in airing his own opinions.”
Well, under that sig line, I’m a little worried about responding, but here’s my idea.
Generally, when pluralizing an acronym, I capitalize the acronym and add a small s. Thus, multiple message boards are MBs, and multiple jerks are SOBs.
As for acronyms ending in S, given the difference in capitalized vs. non-capitalized, I haven’t felt it necessary to add ‘es’ rather than ‘s’- multiple cash registers are POSs, not POSes.
But someone with a style dictionary may well shoot me down on this one.
JMCJ
Not Even Mentioned
Most Popular Poster of the 20th Century Competition
As overseen by Coldfire
There was a previous thread on this topic and the conclusion was to leave the apostrophes out.
I work with a lot of government (military) documents that are full of acronyms and they mostly use apostrophes in their plurals but I’ve started my own little revolution and have been omitting them for weeks now. So far no one’s noticed!
That’ll do, pig. That’ll do.
Thank you both (JC and pluto).
It nice to know that others are of the same opinion.
BTW, that sig line is mostly for my own benefit. 
Prov. 18:2, “The fool takes no pleasure in understanding, but delights in airing his own opinions.”
That should be SDMB, not SMDB. 
<marquee>
The Canadians. They walk among us. William Shatner. Michael J. Fox. Monty Hall. Mike Meyers. Alex Trebek. All of them Canadians. All of them here.
It is correct that the “s” does not require an apostrophy…unless trying to shown ownership such as “NASA’s space mission”.
The real wrench in the issue shows up in baseball. The abbreviation “RBI” stands for “Runs Batted In”. Technically, it is incorrect to speak of “RBIs”, since the word “runs” is already plural and “ins” would make no sense. However, it is an exception from which the meaning is understood.
I know a broadcaster who will not say “RBIs”. It bugs the heck out of his audience, though!
The scary thing is that 90% of the people think they’re above average! - unknown
As often occurs, Jinx, someone isn’t quite thinking that RBI thing through.
A single RBI is a single Run Batted In. Multiple Runs Batted In are usually referred to as RBIs. True, they could better be thought of as RsBI, but just TRY to pronounce THAT! <lol>