- Username should be 3-25 characters long. You can use digits, Latin letters and symbols: . (dot), - (minus), _ (underscore).
- Dot is optional. E.g. if you will register "name", you will be able to use "na.me" and "n.ame" too.
- Usernames are case insensitive. E.g. If you will register "name", you will be able to use "Name" and "NaMe" too.
- Google+ ID should be 21 characters long and is visible when you have opened your Google+ profile. You can find it by looking at this example.
- Only one username is allowed per one Google+ ID. E.g. you can't have two different usernames that redirect to the same Google+ profile.
- You can shorten any URL that points to Google+. For example, URL to persons profile or some specific post.
- Owner or URL can view usage statistics of shortened URL. For example, if you will shorten URL to any of my posts I will be able to view how many people and from where clicked on it.
