Associating entities based on resource associations

1. A computer-implemented method, comprising:

receiving a first profile in a system comprising one or more computers, wherein the first profile is for a first author, wherein the first profile links to one or more first documents, wherein the first author is an author of each of the one or more first documents;

identifying by operation of the system, one or more second authors, wherein each of the one or more second authors is a co-author of one or more of the first documents;

calculating by operation of the system and for each of the one or more second authors, a respective co-author score for the second author that is a measure of how connected the second author and the first author are as co-authors;

ranking by operation of the system, the one or more second authors based on their respective co-author scores;

associating by operation of the system, the one or more second authors with the first profile;

receiving a request from a user to access a profile for the first author; and

providing the first profile for presentation to the user, wherein, when presented to the user, the first profile includes a result list of retrieved and ranked resources associated with the first author and a listing of the one or more second authors in an order according to the ranking of the one or more second authors.

2. The method of claim 1 , wherein calculating a respective co-author score for each of the second authors comprises:

determining a count of co-authored documents, wherein the co-authored documents are first documents that have both the first author and the second author as authors;

determining a recency measure for each of the co-authored documents that measures how recently the co-authored document was written or published;

determining a popularity measure for each of the co-authored documents;

determining an author uniqueness measure for each of the co-authored documents from a total number of co-authors for the co-authored document; and

calculating the co-author score based on the count of the co-authored documents, the recency measures, the popularity measures, and author uniqueness measures for each of the co-authored documents.

3. The method of claim 2 , wherein calculating the co-author score based on the count of the co-authored documents, the recency measures, the popularity measures, and author uniqueness measures for each of the co-authored documents comprises:

combining the count of the co-authored documents, the recency measures, the popularity measures, and the author uniqueness measures for each of the co-authored documents using a combination function to determine the co-author score for the second author.

4. The method of claim 1 , wherein associating the one or more second authors with the first profile comprises:

adding data identifying one or more second authors that each have a respective co-author score that satisfies a threshold, the one or more second authors being ranked in a descending order of the co-authorship score.

5. The method of claim 1 , further comprising:

identifying by operation of the system respective second profiles for one or more of the second authors; and

updating by operation of the system the listing of the one or more second authors to include links to the respective second profiles.

6. A system, comprising:

one or more computers configured to perform operations comprising:

receiving a first profile in a system comprising one or more computers, wherein the first profile is for a first author, wherein the first profile links to one or more first documents, wherein the first author is an author of each of the one or more first documents;

identifying by operation of the system, one or more second authors, wherein each of the one or more second authors is a co-author of one or more of the first documents;

calculating by operation of the system and for each of the one or more second authors, a respective co-author score for the second author that is a measure of how connected the second author and the first author are as co-authors;

ranking by operation of the system, the one or more second authors based on their respective co-author scores;

associating by operation of the system, the one or more second authors with the first profile;

receiving a request from a user to access a profile for the first author; and

providing the first profile for presentation to the user, wherein, when presented to the user, the first profile includes a result list of retrieved and ranked resources associated with the first author and a listing of the one or more second authors in an order according to the ranking of the one or more second authors.

7. The system of claim 6 , wherein calculating a respective co-author score for each of the second authors comprises:

determining a count of co-authored documents, wherein the co-authored documents are first documents that have both the first author and the second author as authors;

determining a recency measure for each of the co-authored documents that measures how recently the co-authored document was written or published;

determining a popularity measure for each of the co-authored documents;

determining an author uniqueness measure for each of the co-authored documents from a total number of co-authors for the co-authored document; and

calculating the co-author score based on the count of the co-authored documents, the recency measures, the popularity measures, and author uniqueness measures for each of the co-authored documents.

8. The system of claim 7 , wherein calculating the co-author score based on the count of the co-authored documents, the recency measures, the popularity measures, and author uniqueness measures for each of the co-authored documents comprises:

combining the count of the co-authored documents, the recency measures, the popularity measures, and the author uniqueness measures for each of the co-authored documents using a combination function to determine the co-author score for the second author.

9. The system of claim 6 , wherein associating the one or more second authors with the first profile comprises:

adding data identifying one or more second authors that each have a respective co-author score that satisfies a threshold, the one or more second authors being ranked in a descending order of the co-authorship score.

10. The system of claim 6 , wherein the operations further comprise:

identifying respective second profiles for one or more of the second authors; and

updating the listing of the one or more second authors to include links to the respective second profiles.

11. A non-transitory computer storage medium encoded with a computer program, the program comprising instructions that when executed by one or more computers cause the one or more computers to perform operations comprising:

receiving a first profile in a system comprising one or more computers, wherein the first profile is for a first author, wherein the first profile links to one or more first documents, wherein the first author is an author of each of the one or more first documents;

identifying by operation of the system, one or more second authors, wherein each of the one or more second authors is a co-author of one or more of the first documents;

calculating by operation of the system and for each of the one or more second authors, a respective co-author score for the second author that is a measure of how connected the second author and the first author are as co-authors;

ranking by operation of the system, the one or more second authors based on their respective co-author scores;

associating by operation of the system, the one or more second authors with the first profile;

receiving a request from a user to access a profile for the first author; and

providing the first profile for presentation to the user, wherein, when presented to the user, the first profile includes a result list of retrieved and ranked resources associated with the first author and a listing of the one or more second authors in an order according to the ranking of the one or more second authors.

12. The computer storage medium of claim 11 , wherein calculating a respective co-author score for each of the second authors comprises:

determining a count of co-authored documents, wherein the co-authored documents are first documents that have both the first author and the second author as authors;

determining a recency measure for each of the co-authored documents that measures how recently the co-authored document was written or published;

determining a popularity measure for each of the co-authored documents;

determining an author uniqueness measure for each of the co-authored documents from a total number of co-authors for the co-authored document; and

calculating the co-author score based on the count of the co-authored documents, the recency measures, the popularity measures, and author uniqueness measures for each of the co-authored documents.

13. The computer storage medium of claim 12 , wherein calculating the co-author score based on the count of the co-authored documents, the recency measures, the popularity measures, and author uniqueness measures for each of the co-authored documents comprises:

combining the count of the co-authored documents, the recency measures, the popularity measures, and the author uniqueness measures for each of the co-authored documents using a combination function to determine the co-author score for the second author.

14. The computer storage medium of claim 11 , wherein associating the one or more second authors with the first profile comprises:

adding data identifying one or more second authors that each have a respective co-author score that satisfies a threshold, the one or more second authors being ranked in a descending order of the co-authorship score.

15. The computer storage medium of claim 11 , wherein the operations further comprise:

identifying respective second profiles for one or more of the second authors; and

updating the listing of the one or more second authors to include links to the respective second profiles.