Facebook as a tool to teach English

The question of using Facebook to teach English as a foreign language was asked in class, I'd like to share my ponit of view about that.

In the one hand, Facebook has many tools : we can share photos, videos, write articles, play games, chat, make groups... It could be a very interesting tool to be used to learn English. It could be a really good way to learn English having fun : students could share photos that the others would watch and comment... But the teacher too!

In the other hand, I think Facebook is not really private, we have many photos we don't want our teachers to watch. We choose our friends on Facebook, so we can put on whatever we want, knowing that our friends are the only who can see or comment it, these photos are personal. That's why I think Facebook is not a very good way to teach English, it belongs to our private life. Therefore, I don't think every children have Facebook today, I have some friends who haven't got it, and even the Internet!