I see more and more accounts with good (more than 50) reputation starting posting scam comments under various posts. So there are more and more hacked Hive accounts. People are not careful enough with their Hive account keys.
Recently I started to see 
Please, be extra careful. Be extra careful extra cautious around links in the comments. If you click on a wrong link, and enter any of your high level account keys, then you can easily lose your access to your Hive account (or the funds in your Hive account).