1. A method comprising: maintaining a profile for the user at a social networking system including a processor, the profile including one or more information items associated with data describing characteristics of the user; identifying one or more information items that have not been updated within a threshold amount of time from a current time from the maintained profile; obtaining a plurality of questions associated with the one or more identified information items at the social networking system; determining, for each of the plurality of questions associated with the one or more identified information items, a response probability based at least in part on one or a combination of a format and a content of the question, the response probability indicating a likelihood of the social networking system receiving a response to the question when presented; determining a data acquisition value for each of the one or more identified information items, the data acquisition value of an identified information item based at least in part on a value to the social networking system of data associated with the identified information item and the determined response probability; selecting a particular identified information item from the one or more identified information items by the social networking system based at least in part on the data acquisition values; and selecting, by the social networking system, a question associated with the particular identified information item for presentation to the user based at least in part on the response probabilities of one or more questions associated with the particular identified information item.
1. A method comprising: maintaining a profile for the user at a social networking system including a processor, the profile including one or more information items associated with data describing characteristics of the user; identifying one or more information items that have not been updated within a threshold amount of time from a current time from the maintained profile; obtaining a plurality of questions associated with the one or more identified information items at the social networking system; determining, for each of the plurality of questions associated with the one or more identified information items, a response probability based at least in part on one or a combination of a format and a content of the question, the response probability indicating a likelihood of the social networking system receiving a response to the question when presented; determining a data acquisition value for each of the one or more identified information items, the data acquisition value of an identified information item based at least in part on a value to the social networking system of data associated with the identified information item and the determined response probability; selecting a particular identified information item from the one or more identified information items by the social networking system based at least in part on the data acquisition values; and selecting, by the social networking system, a question associated with the particular identified information item for presentation to the user based at least in part on the response probabilities of one or more questions associated with the particular identified information item. 3. The method of claim 1 , wherein identifying one or more information items that have not been updated within a threshold amount of time from a current time from the maintained profile comprises: identifying one or more information items associated with data that was previously modified at least the threshold amount of time from the current time.