Filtering recorded interactions by age

1. A method, comprising:

recording logical relationship information, the logical relationship information describing logical relationships between a first user and other users, the logical relationship information associated with a social networking service;

monitoring communications between the first user and the other users, the communications being of at least two different types of communications;

determining, at a server using at least one processor, a first user group in which to add the first user based on the logical relationship information, a first factor and a second factor, the first factor corresponding to a first of the different types of communications and the second factor corresponding to a second of the different types of communications, the determining including applying a first time-varying function to the first factor and a second time-varying function to the second factor to represent an effect of passage of time, the first time-varying function being different than the second time-varying function; and

adding the first user to the first user group.

2. The method of claim 1 , wherein the first or second of the different types of communications is one-on-one communications between the first user and another user.

3. The method of claim 1 , wherein the first or second of the different types of communications is content broadcast from the first user to the other users.

4. The method of claim 1 , wherein one of the first or second time-varying functions is exponential decay.

5. The method of claim 1 , wherein one of the first or second time-varying functions is asymptotic growth.

6. The method of claim 1 , wherein one of the first or second time-varying functions is decreasing ramp.

7. A system comprising:

at least one processor;

data storage comprising modules including instructions to be executed by the at least one processor, the modules comprising:

an interaction recording module configured to record logical relationship information, the logical relationship information describing logical relationships between a first user and other users, the logical relationship information associated with a social networking service, and to monitor communications between the first user and the other users, the communications being of at least two different types of communications;

a candidate scorer module configured to determine, at a server using at least one processor, a first user group in which to add the first user based on the logical relationship information, a first factor and a second factor, the first factor corresponding to a first of the different types of communications and the second factor corresponding to a second of the different types of communications, the determining including applying a first time-varying function to the first factor and a second time-varying function to the second factor to represent an effect of passage of time, the first time-varying function being different than the second time-varying function.

8. The system of claim 7 , wherein the first or second of the different types of communications is one-on-one communications between the first user and another user.

9. The system of claim 7 , wherein the first or second of the different types of communications is content broadcast from the first user to the other users.

10. The system of claim 7 , wherein one of the first or second time-varying functions is exponential decay.

11. The system of claim 7 , wherein one of the first or second time-varying functions is asymptotic growth.

12. The system of claim 7 , wherein one of the first or second time-varying functions is decreasing ramp.

13. A non-transitory computer-readable storage medium comprising instructions that, when executed by at least one processor of a machine, cause the machine to perform operations comprising:

recording logical relationship information, the logical relationship information describing logical relationships between a first user and other users, the logical relationship information associated with a social networking service;

monitoring communications between the first user and the other users, the communications being of at least two different types of communications;

determining, at a server using at least one processor, a first user group in which to add the first user based on the logical relationship information, a first factor and a second factor, the first factor corresponding to a first of the different types of communications and the second factor corresponding to a second of the different types of communications, the determining including applying a first time-varying function to the first factor and a second time-varying function to the second factor to represent an effect of passage of time, the first time-varying function being different than the second time-varying function; and

adding the first user to the first user group.

14. The non-transitory computer-readable storage medium of claim 13 , wherein the first or second of the different types of communications is one-on-one communications between the first user and another user.

15. The non-transitory computer-readable storage medium of claim 13 , wherein the first or second of the different types of communications is content broadcast from the first user to the other users.