Promoting user interaction based on user activity in social networking services

A non-transitory computer readable storage device encoded with one or more computer programs, the one or more computer programs comprising instructions that when executed by data processing apparatus cause the data processing apparatus to perform operations comprising:

• determining a first user activity score for a first user and a second user activity score for a second user, wherein a user activity score is based on the activity of a respective user within a computer-implemented social networking service;
• determining that the first user activity score exceeds a first threshold user activity score and that the second user activity score does not exceed a second threshold user activity score;
• identifying an item distributed by the second user using the social networking service;
• and in response to determining that the first user activity score exceeds the first threshold user activity score and that the second user activity score does not exceed the second threshold user activity score, transmitting instructions to display the item in a stream of the first user, the stream of the first user associated with a social networking account of the first user.

A computer-implemented method executing using one or more processors, the method comprising:

• determining, by the one or more processors, a first user activity score for a first user and a second user activity score for a second user, wherein a user activity score is based on the activity of a respective user within a computer-implemented social networking service;
• determining, by the one or more processors, that the first user activity score exceeds a first threshold user activity score and that the second user activity score does not exceed a second threshold user activity score;
• identifying, by the one or more processors, an item distributed by the second user using the social networking service;
• and
• in response to determining that the first user activity score exceeds the first threshold user activity score and that the second user activity score does not exceed the second threshold user activity score, transmitting, by the one or more processors, instructions to display the item in a stream of the first user, the stream of the first user associated with a social networking account of the first user.