Google+

The first 24 hours - here's what I've picked up so far:


Circles 


You create circles, which are like Facebook and Twitter 'Lists'. These can be for people sharing hobbies, news, friends, family, spam, stalkers - call them what you like! You can put people in more than one circle if you want. (I have some in "Friends" and also "Rowers" for example). 


When you post anything - you choose which 'circle/s' it is shown to, each time. This way, you can moderate who sees what. If it's personal you may want it to go only to family and/or friends. If it's not personal and you want to share or ask something of anyone, it can be public. I like that bit about it, gives more control over privacy. If I want to post a rowing question, or workout summary, instead of boring the pants of every non-rower, I can just select Rowers and only those people will see it! (improvement, I know!)


Posts


These are like Tweets, or Facebook statuses, except you aren't limited to 140 characters and you can ramble on if you want. 


You can also choose which 'stream' you read. This is like your timeline on Twitter, or Newsfeed on Facebook. Again, you can select circle or circles to read through to sift out any junk or to read posts from specific groups/lists you are interested in.


+1


If you like something or agree with something, you can "+1" it. Anyone in that post can see this. It's a bit like "Like" on Facebook.


Share


A bit like "ReTweet" on Twitter, it comes from you on your stream (to the circles you share it with), showing the originator and your comment.


People Who've Added You


A bit like Followers on Twitter, or Friends on Facebook - except you don't get to see which circle/s they have categorized you in. Nobody else can see that bit either so if you've been labelled a stalker - only the person labelling you that can see!


So far, that's the basics, I'm still learning. I'll maybe write a newbie guide when I get to grips with it more and am able to put something simple together for others to learn from.


Cheers! 
(in anticipation of +1's, shares, likes and ReTweets haha!)