Google+ is founded in 2011 as Circles than renamed to Google+. Initially it was an invitation only service. After it has gained attention of masses, Google removed this restriction. Main difference from the other social services is Google's circle approach. Circles is a way to map friends to groups, like family, friends, work, etc., without limiting one to take part in more than one group. A friend may be both in work, and friend etc. You can create a post that is only visible to people listed on family circle. Also you can fine grain this visibility on person basis. Other social networks also have similar solutions but neither of them is more realistic than circles or easier to use. Also you can limit re sharing of your posts, make them only read only.This stops your posts from spreading. Google+ does not have any direct competition from the other social services hence, it does provide social services for already well known Google services, like Picasa, GoogleTalk, YouTube,Google Drive etc, by providing Google+ menu bar at the top of the page. Google+ posts are not constrained to any single or limited type, but also possible to share a Google Docs document and start working on that document at same time with everyone you share. It resurrects some good portions of Google's previous social network attempts, Wave's strong focus on workspace collaboration can be seen in GoogleDocs' integration. Google's profile resembles the Buzz's account settings.
Here is how to sign up to Google+
If you are using any one of the Google services than it is easier for you to join Google+. If you do not have Google account, we advise you to create a GMail account. First you need to login GMail. Than click on the email address on top left corner. A box will appear. Click on Join Google+ link inside the box.
Now you have Google+ account. Don't forget to add us to your circles.