Half an hour ago my daughter found this interesting writing site, called 750 Words.

750 Words - Write every day.

It's more about writing ('getting into your brain') than actual learning. But you should have fun putting to practise a regular writing regime, and being most encouraged for it by other writers. It's a husband and wife team who are also on Twitter and Facebook. I think it's worth trying, and if you have a bash at it, please let us know how well you did.