Just a quick note about G+ Hangouts, if you want to use a Linux system you need to install it only on a Debian or Fedora based distribution.
I've tried it to chat with an Ubuntu laptop and it works fine, no chanches with Gentoo, Slack, Arch, ... there's just a minimal support to Linux for it, I've seen messages about tests on porting these RPMs on other distros but it seems to be too early to use them without troubles