While more people sign up for steemit, more people are sharing their private memo key.
While your private memo key cannot be used to steal your funds or post/comment/upvote on your behalf it will be implemented in the future for private messaging as well as it is a bad practice to share your private keys to the public and you should change your password whenever your key gets exposed.
Here are 8 accounts which I was able to get their private memo by just searching on https://steemd.com/@bittrex where anyone can do it and can access them.
vsf | 5KfZ1FkJgUbVnViHxMgtyMUYrHrrW99XyXzmRB8DyLKQ7dcD8nU |
endymionoriax | 5Kj7M7E6XNCiGQf4xaqJnXx2s1YMeQeLRMqSfnNivw9f9okpJFb |
irozo | 5K55DpG6tXMEGMeUQ1h1ZNjw1mwmMx3SmQAXg2d3H2neHvry3aL |
mjh2521 | 5JES3J7KJgMVjSGLckaPfxcptLQenNkgGSow36kR5VXYY3VTED6 |
niekoshkie | 5JHUaiH84vmmdP7qoD6kTR2j5E3TWsKYr2XMLrECVYkfDvG9CL6 |
wimpiam | 5KEsnAdphDaiX6g9feoTnsnhXevUShcMB8sQ9Gpdct4gA6RGygV |
ernick | 5Ji4JvHWL7Vr4FrNtLuHKtmU2wYRJMNBdczYn7vjUuixHjuH5Kr |
rymac2530 | 5JxfHW5Lwq4GrQDAgzfhY8N1uAmFT1LZcC1sm6tadJaqaZ8qot8 |
If you are on this list you should change your password and never share your private key when transferring steem/sbd to anyone.