Google+ doesn't offers a vanity URL for your profile, unlike Facebook and Twitter. Instead of vanity URL Google+ has used a long number string to denote users, which make it difficult to share it with friends (eg:106612582649701414961)
The reason Google+ doesn’t use vanity URLs is because those could lead to spammers figuring out the email addresses of millions of Google+ users (since many Google Accounts are linked to Gmail accounts).
Now at this point, GPlus.to comes into play.
GPlus.to makes your Google+ profile URL short, like GPlus.to/Your-Name, which makes it easy to remember and share with your friends.
Should Google+ allow users to create vanity URL or it is very much of security concern, Your views are always welcome...