I used the STTwitter API.
there is a method to get favorites:
// GET statuses/:id/activity/summary.json
- (NSObject *)_getStatusesActivitySummaryForStatusID:(NSString *)statusID
successBlock:(void(^)(NSArray *favoriters, NSArray *repliers, NSArray *retweeters, NSInteger favoritersCount, NSInteger repliersCount, NSInteger retweetersCount))successBlock
errorBlock:(void(^)(NSError *error))errorBlock;
this is the url:
NSString *resource = [NSString stringWithFormat:@“statuses/%@/activity/summary.json”, statusID];
this is the error message:
error Domain=STTwitterTwitterErrorDomain Code=220 “Your credentials do not allow access to this resource” UserInfo={NSLocalizedDescription=Your credentials do not allow access to this resource}