You cannot unlock a phone using Gmail. Gmail is only connected if you login the lock application using it. It can help if you forgot your code.
You cannot access Facebook account using Gmail. You have to use it using the Facebook site only. Gmail is just for confirming the account.
No, you cannot recover Gmail using Facebook. You have to recover it via Gmail only. Both of these are different organisations.
Gmail is an email service. You do not make or host websites using it.
No, you can't delete Facebook using Gmail. To delete Facebook, you have to go on their website. Gmail just is an interface.
You can chat on Gmail using the Hangouts. It is the official Instant Messaging app of Gmail. You can start chatting on that using iPod touch too.
A benefit of using Gmail through an SMTP client instead of the Gmail website is that SMTP usually works better and faster, and you don't have to use the commercial Gmail if you dislike it.
Yes you do. And here is where you will find it if you are using windows! http://toolbar.Google.com/gmail-helper/notifier_windows.HTML This is where to get it if you are using MAC! http://toolbar.Google.com/gmail-helper/notifier_mac.HTML
You can create a Facebook account via Gmail. This links Gmail to connect with Facebook. The mails that you receive from Facebook are on this mail.
You cannot send an SMS using Gmail. Gmail is for sending mails and chats. You can however send a mail to the person in their mailbox.
You can talk on chat using Gmail. Gmail has an instant messaging service in it too. It is called as Hangouts.
This means you could log in via Gmail. Gmail acts as an account universally. You can log into most of the accounts using this.