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Well, i disagree. Below 50 reputation, they are useless.

That doesn't mean you can't use then. Besides, you have to do more than post a photo or run a contest. It's a good start but it's far from being enough. You have to let people know you exist, you have to engage. You can do that by meaningful comments.

Already i have 100 friends. I have my own community. I want to use them later.

If you're not satisfied with your results it means that's not enough. Don't get me wrong, I just want you to understand how those, who didn't use bots, got their results.