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Mentions"
To "Mention" someone, simply type @ and then their user name. So for instance, qpurser would mention a member called qpurser.
The mention will be converted into a link to their profile, an entry will be added to their profile, and they will receive either an email or a forum notification that someone wants their attention.
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Thread Tags"
To "Tag" someone, click the "Tag User(s)" button in a thread, then enter the username(s) of the users you want to tag separated by a semi-colon.
The tag list will update with links to their profiles, an entry will be added to their profile, and they will receive either an email or a forum notification that someone wants their attention.
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Hash Tags"
Using a "hash tag" is quite similar to using a "Mention" - you simply type # followed by the word. So for instance,
#winning will create a hash tag for the word "winning".
The hash tag will be converted into a link to a page showing all other posts / blogs / etc that used the same hash tag, and users who subscribed to that particular hash tag will receive a notification similar to the other two types.
You should use hash tags in a similar fashion you'd use them on Twitter or Instagram, to "categorise" your content. This will allow users to quickly find other content similar to the content you just produced.