Simplify the following text for a Grade 9 native English-speaking person.
Original: The community aspect of BookCrossing.com has grown and expanded in ways that were not expected at the outset , in the form of blog or forum discussions , mailing lists and annual conventions throughout the world .
Simplified: The community aspect of BookCrossing.com has grown in ways that were not expected at the start , in the form of blog or forum discussions , mailing lists and yearly conventions all over the world .