Sorry for replying late. I wasn't notified.

No club

To encourage power-ups, clubs were formed by the Steemit team and it's mandatory to be a part of any of the three clubs to get support from steemcurator accounts.

#club5050 : Use this tag if you have powered up at least 50% of your rewards over the period of one month.
#club75: Use this tag if you have powered up at least 75% of your rewards over the period of two months.
#club100: Use this tag if you powered up 100% of your rewards over the period of 3 months.

Burnsteem25

It is another initiative by the Steemit team that can help control the price of STEEM from going down. You can use the tag #burnsteem25 in a post where you have set 25% beneficiary to the account @null. For more details on the topic read this:
Do we need to Burn STEEM?

Steem Exclusive

This means that the content published on Steemit should be solely created for Steemit and is not shared on any other platform if you are creating content exclusively for Steemit, use #steemexclusive in your posts.
Steemit team encourages to create only steem exclusive content.

You got a cross here by mistake, I guess. Or if you are sharing content on another platform then don't. You won't get support.