I just logged onto my tumblr and got a message saying that "suspicious activity" had been detected on my account, so it advised a password change. It also said not to use the password on any site other than tumblr (if it it's referring to the original one I had, then I did use it to log in to email so I could change it). I checked my blog and the layout had kind of completely changed. As far as I could tell, none of my posts had been deleted or anything. I fixed it about as close as I could to how it originally was, after I changed my password there and on two other sites I use. Should I be worried? How many different passwords do you guys generally use?