| Content-based recommendation in social tagging systems Recent countries visiting this post |  |
 | 5 | United States |
 | 3 | Hong Kong |
 | 1 | |
 | 1 | China |
| Content-based recommendation in social tagging systems Recent countries visiting this post | |
| 5 | United States |
| 3 | Hong Kong |
| 1 | |
| 1 | China |