While I wouldn't use Cryptocat for mission-critical secret communications, it does add a modicum of security and privacy over the features built into Google and Facebook, and it's just as easy to use. After installing a Chrome or Firefox extension, all you have to do is pick a nick (a handle) and a title for your chat room, and presto--you can chat with any other Cryptocat user who joins the room. The aesthetic is decidedly old-school 8-bit, but that only adds to Cryptocat's charm. It's a nice way to chat with friends, and can serve as a reminder that it's important to use other forms of security, too.
A little security goes a long way
With security software, it's easy to go overboard. You could create a small KeePass database, steganographically embed it in an MP3 file, put that file into a TrueCrypt volume, and then launch Tor and tell your friends all about it on Cryptocat. That might be a fun experiment, but in reality, it takes just a handful of best practices to significantly bolster security. If this article makes you do just one thing, I hope it gets you to adopt KeePass and take password security more seriously. And if you're already using a password manager, well, there's always more you can do to further protect your privacy and reduce the risks that come with constantly being online.