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Most accounts with no content are just duplicate accounts used for upvoting and other (possibly nefarious) purposes. Flagging them doesn't do any good because of their reputation and account size (Voting Strength).

If the person who flagged you. of their rep is high enough, it'll lower yours, once it gets in the - Steemit instantly hides your comments/posts

Flagging a post doesn't make that post invisible, just less visible. It also removes rewards if the downvote is powerful enough. Those who flag for no reason are bullies, and Steemit seems to have more than enough trolling around!

This site should be re-named from Steemit to Reddit 2.0, people down vote you in Reddit for no reason as well. And it still won't let me sign up for that site you told me about

@aaliyahholt, thanks for letting me know about sign-up troubles. I will forward this to the Devs. It might also be good to leave a message on the Stishit facebook page.