I'm clearly becoming a curmudgeon in my middle age. I'm finding it increasingly annoying that no one seems to use the word "whom" anymore. I'm not just talking about bloggers; I'm talking about print journalists and even novelists.
It's really not that difficult to understand when to use "whom" instead of "who."
"Who" is the subject of a verb (the one doing the action). "Whom" is the object (the one to whom the action is being done).
Here's a simple test. Can you substitute "he" in place of "who" in your sentence and have it sound correct? Do you need to substitute "him" instead? "He" is to "who" as "him" is to "whom."
I'll give a shout-out to any blogger whom I see use the word "whom" correctly.