Much like people using big words that they don't know what they mean, I am weary of people who use punctuation without understand its function. Long story short, individual at work called "editor" has very little editing skills. I kind of lost count, but I think I counted nine punctuation errors in one article today?
Look, I'm a little biased. I wanted that job. I have the skills for it, it pays more, and I would have my own office. An office with windows. Office politics, etc., they give it to someone without even a "hey, this position is open" announcement.
Still. Two "editors" read the article, and clearly not another soul but me knows how to use a semicolon. Seriously kids, it's not hard. Connecting independent clauses and separating units in a series when one or more unit has a comma. For the general population, that's as much as you need to know. It does get more detailed; some sites will tell you that it's acceptable to use a semicolon when introducing a list, but I strongly favor a colon. (Am also an advocate for Oxford [or serial] comma in general. Ask me later.)
I've seen semicolons used when they should have used a comma, colon, em dash, etc. But oh, don't even get me started on dashes. Hyphen when it should be en dash, en dash when it should be em dash...the horror! The horror!
Uh, I think I feel way too strongly about punctuation. Maybe I'll just stop here and go read the Chicago Manual of Style.