a tool to create blogs.

a professional association.

a CoP to practice languages.

a webinar application

is a tool to create blogs.

a tool to follow blogs

A & B are correct.

an application to migrate contents from MS Word to Blogger and WordPress.

Microblogging.

Synchronous communication.

asynchronous communication.

Asynchronous interaction.

Is a space to hold webinars.

is a website can be edited by different users.

is a website created for educational purposes.

is a website that can be edited by different users if is has an educational purpose.

Blogs.

Twitter.

Wikis

Chats.