I think I asked this before, but I couldn’t readily locate the thread.
Would someone please explain to this old codger the use/appeal of hashtags?
I’ve never tweeted, nor have I intentionally sought a tweet. I don’t recall having ever intentionally clicked on a hashtag - until recently.
I’m having an instrument custom built, and have been checking the builder’s facebook site as I await completion/delivery. They periodically post pictures and messages, accompanied by hashtags. When I click on those hashtags, more often than not I find information that is not of any interest to me. For example, my instrument is a model called “Bohemian”. One of the hashtags is #bohemian. When I go there, I see the message I previously saw on the company’s facebook site, as well as a number of messages and pictures of diverse things related to Bohemia and Bohemians.
Some of the hashtags are more specific, and are more directly related to instruments. But most of them impress me as too vague to be of interest to someone who is interested in the original material. Perhaps this particular company is not very astute in using these hashtags, but I can’t imagine how bored someone would have to be to click on all of these hashtags in search of material of interest. (And I often find myself PLENTY bored!)
Hashtags are just a way of trying to link related subjects. I might tweet about my favorite team #Razorbacks
It is error prone. Abbreviations or misspellings can easily cause posts to get missed. People often include multiple tags. #ARRazorbacks, #ARBasketball etc. to widen the chances of getting linked to other posts.
It’s still more convenient then manually typing in searches.
Yeah - I guess my perception is different. Looking at various hashtags didn’t turn up anything I was interested in, that I hadn’t readily found thru more traditional searches. And I had to wade thru a TON of dross to get to it.
Thanks. I’ll just be over here in my rocker, getting more and more out of touch! 
The problem with hashtags is that they are not exclusive. So a hashtag #Covid_19 will bring too much information - it’s being used by too many people.
The hashtag #CoronaInfoCH is more limited, as it is only for Switzerland.
In the example you gave, I am surprised that they didn’t use #bohmemiaguitar. Which is a valid hashtag, but maybe it’s a different company.
There is a television show on BBC called staged, so the hashtag is #staged. Quite convenient. And it’s differentiated from the Twitter account itself which is @Staged2020.
#bohemianbass, actually. 
I guess I can see them throwing their stuff out and about, like #uprightbass, where people who were not already familiar w/ their site and product might be encouraged to peek. But from the other side, as someone who already IS somewhat familiar, following the hashtags seemed a complete waste of time.
Bass is finished, just awaiting delivery - YAY!