| Category | Users | Items | Ratings | |||
|---|---|---|---|---|---|---|
| Arts Crafts and Sewing | 3,051 | 566 | 4,004 | ratings | reviews | metadata |
| Automotive | 5,133 | 511 | 5,364 | ratings | reviews | metadata |
| Books | 222,178 | 29,065 | 345,888 | ratings | reviews | metadata |
| CDs and Vinyl | 0 | 0 | 0 | ratings | reviews | metadata |
| Cell Phones and Accessories | 32,835 | 1,937 | 40,136 | ratings | reviews | metadata |
| Digital Music | 25 | 5 | 25 | ratings | reviews | metadata |
| Electronics | 208,176 | 6,579 | 257,559 | ratings | reviews | metadata |
| Grocery and Gourmet Food | 1,373 | 202 | 1,398 | ratings | reviews | metadata |
| Home and Kitchen | 12,258 | 1,645 | 13,052 | ratings | reviews | metadata |
| Industrial and Scientific | 2,481 | 351 | 2,814 | ratings | reviews | metadata |
| Kindle Store | 0 | 0 | 0 | ratings | reviews | metadata |
| Movies and TV | 2,751 | 403 | 4,105 | ratings | reviews | metadata |
| Musical Instruments | 12,467 | 1,059 | 21,165 | ratings | reviews | metadata |
| Office Products | 15,961 | 1,078 | 17,717 | ratings | reviews | metadata |
| Sports and Outdoors | 4,439 | 914 | 4,597 | ratings | reviews | metadata |
| Toys and Games | 25,647 | 1,578 | 30,783 | ratings | reviews | metadata |
| Overall | 507,581 | 45,893 | 748,607 |