With the HPI Identity Leak Checker, it is possible to check whether your e-mail address, along with other personal data (e.g. telephone number, date of birth or address), has been made public on the Internet where it can be misused for malicious purposes.
"Top verified data leaks
Here we highlight some of largest-volume data leaks in our database and which have already been verified by the attacked site itself or by its community. Each of them has been made publicly available by the attackers themselves or by those affected through different websites. All this information can also be followed by RSS and Twitter."
'Keybase is a new and free security app for mobile phones and computers. For the geeks among us: it's open source and powered by public-key cryptography. Keybase is for anyone. Imagine a Slack for the whole world, except end-to-end encrypted across all your devices. Or a Team Dropbox where the server can't leak your files or be hacked.'