Who is Savanna and she was the first one in their grade to have what?

From the text:

Savanna is probably the most popular girl in the school. All the boys like her. All the girls want to be friends with her. She was the first girl in the grade to actually have a "boyfriend." It was some kid who goes to MS 281, though she dumped him and started dating Henry Joplin, which makes sense because the two of them totally look like teenagers already.