I don't do a lot of online chatting, but nonetheless I don't want my conversations watched. We know that Facebook monitors our conversations on their website, explicitly to scan for criminal activity (already pretty creepy) but who knows whether that information is staying in those bots for those purposes. Every app asks for a bunch of permissions, so your information might be filtered into dozens of advertisers' statistical analysis. But I can barely get the regular internet to work, there's no way I can set up a secure chat service. (I tried to use Tor once, it went horribly.) Unfortunately, the same is true of a lot of people who need that protection a lot more than me.
This quote is from Wired's article about CryptoCat, and its creator, Nadim Kobeissi:
When faced with the torture of using crypto software or the torture of a repressive government, some dissidents have — intentionally or not — opted for the latter.
CryptoCat -- URL: crypto.cat -- is a secure chat service that's easy and pretty. I know it is, because I used it. I opened it up on two computers and talked to myself. You set up a custom or randomly generated URL for a single-use chat, and you can invite people in through Facebook or give them the URL. Kobeissi also has an adorable video on Vimeo explaining the service.
The program is open-source, so anyone can look at the code. It's secure, and it doesn't save your information. Cat-themed though it may be, this is a very important worldwide resource, and could save lives in more oppressive countries.