More concepts updates.

docs/client/concepts.html

@@ -191,15 +191,19 @@ modify data, those modifications can run locally without waiting for the
 confirmation from the server, while still giving the server final say
 over the requested change.
 
-Meteor provides low-level APIs that allows any login system to take advantage of
-the data and RPC security features, but most developers will want to use [Meteor
-Accounts](#accounts_api), our full-featured authentication system featuring both
-secure login with passwords and integration with external services such as
-Facebook and Twitter. To help you make your app secure as quickly as possible,
-you can even use [Accounts UI](#accountsui), a pre-built user interface which
-lets you add a complete login and signup system to your app with just one line
-of code. It even contains password change, email-based password reset, and
-configuration wizards for the external service providers.
+Meteor includes [Meteor Accounts](#accounts_api), a state-of-the-art
+authentication system. It features secure password login using the [Secure
+Remote Password
+protocol](http://en.wikipedia.org/wiki/Secure_Remote_Password_protocol), and
+integration with external services including Facebook, GitHub, Google, Twitter,
+and Weibo. Meteor Accounts defines a [`Meteor.users`](#meteor_users) collection
+where developers can store application-specific user data.
+
+Meteor also includes pre-built forms for common tasks like login, signup,
+password change, and password reset emails. You can add [Accounts
+UI](#accountsui) to your app with just one line of code. The `accounts-ui` smart
+package even provides a configuration wizard that walks you through the steps to
+set up the external login services you're using in your app.
 
 {{#note}}
 The current release of Meteor supports MongoDB, the popular document