All of these are great options! One other thing I mention as an alternative to Google+ is Minds or Gab.ai. Both platforms operate on a commitment to freedom of speech and non-censorship.
Another good browser alternative is Opera. Running on the Chromium base that Google Chrome does, it has nearly the same amount of compatibility with plugins and websites as Chrome does, but without the fear of Google knowing all of your business.
Another good messenger alternative is Telegram, providing end-to-end encryption and now encrypted calling as well.
DuckDuckGo is an amazing search engine, and serves an integral part of an open-source, private existence, free from Facebook, Google, and those that have no right knowing who you are, what you say, or what you do!