Also notes, contacts, file transfers, reminders and more.
Spam? Spam is everywhere and if it is not now, is because it's not popular. Once it gets to the level of "email", they will make sure you are getting spammed.
What bothers me is that people look for alternatives to make us more "locked" aka "safe" instead of trying to educate. We, devs/sysadmins, have to find ways to make sure that people know how to use and protect themselves not to hijack the tools they use/work/need just because we like to be EDGY.