Comment with email or social networks I am developing my personal site in drupal 7. Actually i am searching for a module which allows anonymous users commenting with their email or any social n/w like twitter,facebook or google+. Is there any good module available or is drupal 7 supports  anonymous users commenting with their email address ?
You can achieve that using the OpenID Selector module

This module integrates Javascript OpenID Selector with Drupal's OpenID client.
This module substitutes Drupal's default OpenID form with Javascript OpenID Selector widget, so users do not even need to know what OpenID URL is.