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I think that Steemit does not send notifications that you have been tagged, it is a known issue with Steemit. I didn't see this until now. I may have to switch to busy.org. I left another comment below.

I've been using busy since the second day I made my steemit account, I had no problems with it.
Here are some features of BUSY

ACTIVITY
activitate.jpg


NOTIFICATIONS

notificari.jpg


WALLET
portofel.jpg

Thanks, I'm actually trying it out right now. I didn't realize I needed to activate the slider and I gave you a 100% up-vote on one of your comments! ;)