You may appear safe but you never know... Services like Google and Facebook are pretty proactive about making sure unknown users can't access your account easily -- meaning that if someone from Thailand tried to access your account when you usually use it in the US from an unknown device, it'll generally not allow the login. But other services aren't as proactive and may be compromised, so it's definitely better to be safe. The best way is to use unique passwords for every service (or use OAuth with a service provider you trust), and a simple way to do that is with a password manager.
I personally recommend 1password, because they haven't had vulnerability issues like LastPass and don't store passwords in their cloud, but they store it in "your" cloud, e.g. iCloud, Dropbox, and it works very well on iPhone. But at the minimum just using a separate password for everything is the best way to mitigate these kinds of issues.
I personally recommend 1password, because they haven't had vulnerability issues like LastPass and don't store passwords in their cloud, but they store it in "your" cloud, e.g. iCloud, Dropbox, and it works very well on iPhone. But at the minimum just using a separate password for everything is the best way to mitigate these kinds of issues.