Trusted participants of social network providing answers to questions through on-line conversations

1. A system comprising:

one or more computers; and

a computer-readable medium coupled to the one or more computers having instructions stored thereon which, when executed by the one or more computers, cause the one or more computers to perform operations comprising:

receiving a search query from a computing device;

determining that a quantity of search results that are responsive to the search query does not exceed a predefined threshold;

based on determining that the quantity of search results does not exceed the predefined threshold, providing a graphical user interface that includes a plurality of the search results and a control;

determining that a user of the computing device has selected the control and, in response thereto, submitting a question to trusted participants of an online conversation, wherein the trusted participants include the user, one or more advertisers, and one or more social network friends of the user;

obtaining a reply to the question from one of the trusted participants; and

providing the reply to the other trusted participants.

2. The system of claim 1 , wherein the one or more advertisers are parties that have paid to answer questions.

3. The system of claim 1 , wherein the operations further comprise providing the question to the trusted participants only.

4. The system of claim 1 , wherein submitting the question to trusted participants of the online conversation comprises:

restating one or more terms of the search query as a natural language question; and

submitting the natural language question as the question to the trusted participants of the online conversation.

5. The system of claim 1 , wherein providing the reply to the other trusted participants further comprises providing the reply to the other trusted participants only.

6. The system of claim 1 , wherein submitting the question to the trusted participants of the online conversation comprises:

anonymizing the question; and

providing the anonymized question to the one or more advertisers.

7. The system of claim 1 , wherein the operations further comprise:

storing the question and the answer in a search engine index.

8. The system of claim 1 , wherein the social network friends are parties who are acquainted through an online relationship with the user.

9. The system of claim 1 , wherein the operations further comprise:

determining a permission level associated with a particular trusted participant;

determining that the permission level satisfies a threshold associated with creating, editing, deleting, or applying a label to the reply; and

receiving information from the particular trusted participant to create, edit, delete, or apply a label to the answer based on determining that the permission level satisfies the threshold associated with creating, editing, deleting or applying the label to the answer, respectively.

10. The system of claim 1 , wherein prior to providing the question, determining that one or more of the trusted participants have special knowledge regarding the search query.

11. The system of claim 1 , wherein prior to providing the question, determining that a quantity of the search results exceeds a predefined threshold.

12. The system of claim 1 , wherein the graphical user interface includes a search box for accepting a search query, and a separate question entry field for accepting the question.

13. The system of claim 1 , wherein prior to providing the question, further comprising:

determining a quantity of conversations that a search engine identifies as being relevant to the search query and that have no answer posted; and

determining that the quantity of conversations exceeds a predefined threshold.

14. A method comprising:

receiving a search query from a computing device;

determining that a quantity of search results that are responsive to the search query does not exceed a predefined threshold;

based on determining that the quantity of search results does not exceed the predefined threshold, providing a graphical user interface that includes a plurality of the search results and a control;

determining, by one or more computers, that a user of the computing device has selected the control and, in response thereto, submitting a question to trusted participants of an online conversation, wherein the trusted participants include the user, one or more advertisers, and one or more social network friends of the user;

obtaining a reply to the question from one of the trusted participants; and

providing the reply to the other trusted participants.

15. A computer storage medium encoded with a computer program, the program comprising instructions that when executed by data processing apparatus cause the data processing apparatus to perform operations comprising:

receiving a search query from a computing device;

determining that a quantity of search results that are responsive to the search query does not exceed a predefined threshold;

based on determining that the quantity of search results does not exceed the predefined threshold, providing a graphical user interface that includes a plurality of the search results and a control;

determining that a user of the computing device has selected the control and, in response thereto, submitting a question to trusted participants of an online conversation, wherein the trusted participants include the user, one or more advertisers, and one or more social network friends of the user;

obtaining a reply to the question from one of the trusted participants; and

providing the reply to the other trusted participants.