Facebook and Twitter Comments
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Here at WordPress.com you and your visitors can use your Facebook, Twitter or WordPress.com account to leave comments. This unified comment form including Facebook and Twitter login is active on all WordPress.com blogs.
Logging in
When your readers click on the Facebook or Twitter icon a new window will appear from that service asking them to log in and approve giving their information to your blog. This window is controlled by Facebook or Twitter for security reasons.
It is possible to be logged in to different services at the same time, in which case visitors to your blog will be able to choose which identity to use when posting a comment by simply clicking the appropriate icon in the comment area. They can also choose to leave a comment as a guest if they wish (unless your settings prevent that).
The comments area will detect the theme you are using and switch between a light or dark version automatically to better blend in.

Changing the Prompt
If you want to change the prompt that appears before the comment area (Common defaults are “Leave a Comment” and “What are you thinking?”), go to your dashboard, then Settings -> Discussion, and change the comment prompt to whatever text you would like.

Still confused?
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