Tags are something else. I think you mean "mention".you can mention your friends by typing @usernameofyourfriend

Like: Hello @maccalister!
The Tags usee to put your post in a category. There are a lot of popular Categorys. Like:

life
bitcoin
money
..
..

Or you can creat a Category by your own by using a worth. The tags should have to do with your Post.

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