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YES, steemfollower.com only wants your posting private key, not steemit password.
don't enter your password, just posting key is enough.
some note:

  • you will login by steemconnect.com, it is secure enough.
  • you will accept to only give upvote and follow access.
  • your information is not stored at steemfollower.com

Just test once, it is still beta version.

oh i didn't see that, thought it was only asking for password