1. A method for determining a property of a user in a social network platform, being executed on a hardware device, the method comprising: determining a property of a seed user in the social network platform; determining a property of a social network platform function interacting with a user according to a property of the user in the social network platform; and determining a property of a user interacting with a social network platform function according to a property of the social network platform function; wherein the determining the property of the seed user in the social network platform comprises: determining the seed user in the social network platform; obtaining a user tag input by the seed user; determining the property of the seed user according to the user tag input by the seed user and a pre-stored relationship between user tags and user properties; and checking and modifying the property of the seed user; wherein determining the property of the social network platform function interacting with the user according to the property of the user in the social network platform comprises: obtaining social network platform functions interacting with the user in a predefined period; and performing processes for each obtained social network platform function: at process A1), properties of all users interacting with the social network platform function are queried; at process B1), N properties most frequently appearing in a querying result are taken as an intermediate result of the property of the social network platform function, and a ratio of the number of appearances of each property to the total number of appearances of the N properties is taken as a weight of the property, wherein N is a predefined integer; and at process C1), the intermediate result is taken as a final property of the social network platform function; or the weight of the property of the social network platform function that has been calculated last time is multiplied by a predefined ratio to obtain a value, the value is added by the weight of the property in the intermediate result that is calculated this time to obtain a final weight, and N properties with the largest final weights are taken as the final property of the social network platform function.