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