Hashtags are not a requirement. In fact, I'd rather not see a huge number of hashtags suddenly appear for no good reason. However, I can see a use for the hashtags #tonertransfer #CuCl #KiCAD if you feel that what you are posting might be relevant to some future person looking for information on that topic.
As such, please be cautious when using the # symbol. If you use it with spaces on either side, all is well. But the moment you have some alphanumeric immediately following, such as for a phone number, 开云体育 turns it into a hashtag automatically. It isn't a huge deal, but the moderators will have to go in and clean those out periodically. And we don't get paid anything.
The same goes for spelling of hashtags. If you misspell it, it doesn't appear under that hashtag, but creates a separate hashtag. The moderators can delete the offending hashtag, but cannot add your message or any thread created under it to an existing hashtag.
The hashtag only has to appear somewhere in the message or Subject line, everything else gets taken care of automagically. I think I'd prefer they be in the message body, as it takes up limited reading space for the Subject. Or if you are writing a message online, under the Subject line, there is an "Add Tags" box that will show all existing hashtags.
If you are reading a message online, you can click on the hashtag in the message to see a list of all messages with that hashtag, regardless of subject threads.
Or look to your left, and you'll see "# Hashtags" just under "Messages". Click on this, you'll see a table of all hashtags available. Just click on one to see the list of messages with that hashtag.
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Steven Greenfield AE7HD