| To index or not to index: time-space trade-offs in search engines with positional ranking functions Recent countries visiting this post |  |
 | 9 | United States |
 | 5 | China |
 | 5 | |
 | 3 | Germany |
 | 1 | United Kingdom |
 | 1 | Italy |
| To index or not to index: time-space trade-offs in search engines with positional ranking functions Recent countries visiting this post | |
| 9 | United States |
| 5 | China |
| 5 | |
| 3 | Germany |
| 1 | United Kingdom |
| 1 | Italy |