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https://www.hivesbi.com/

Love my HSBI shares and the votes I receive!

Basically the more of these shares you have, the bigger/more frequent votes on your posts you get from them. Since you only have 4 shares, you probably aren't getting voted on every post, but check under who voted on you're posts and look for steembasicincome or sbi 1 sbi2 sbi3 etc. That's them voting on your posts because you have some shares. :)