gistfile1.m

NSInteger count = [timelineData count];
for (NSInteger index = (count - 1); index >= 0; index--) {
    NSMutableDictionary *tweet = timelineData[index];
    if (tweet[@"retweeted_status"]) {
        [timelineData removeObjectAtIndex:index];
    } else {
        NSMutableDictionary *userObject = [tweet[@"user"] mutableCopy];
        int fav_count = tweet[@"favorite_count"];
        int rt_count = tweet[@"retweet_count"];
        int follower_count = userObject[@"followers_count"];
        
        float score = (((float)fav_count + (float)rt_count) / (float)follower_count) * 1000;
        
        [timelineData[index] setObject:[NSNumber numberWithFloat:score] forKey:@"score"];
    }
}

NSMutableArray *sortedArray;
sortedArray = [timelineData sortedArrayUsingComparator:^NSComparisonResult(id a, id b) {
    float firstScore = [a[@"score"] floatValue];
    float secondScore = [b[@"score"] floatValue];
    if (firstScore > secondScore) {
        return (NSComparisonResult)NSOrderedAscending;
    }
    
    if (firstScore < secondScore) {
        return (NSComparisonResult)NSOrderedDescending;
    }
    return (NSComparisonResult)NSOrderedSame;
}];


_tweets = [sortedArray subarrayWithRange:NSMakeRange(0, 10)];