How to Measure retweets and top influencer in twitter

According to Twitter API, it returns up to 100 of the first retweets of a given tweet.

1. What is the best way to measure number of retweets, when the amount is higher than 100?
2. What is the best way to find top influencer of my tweet (Person, who retweeted my tweet, and he has the highest number of retweets.

 found the answers:

1. Twitter API Get Status provide amount of retweets: "retweet_count" If you want to get all retweets you should periodically query Twitter to get retweets.

   Note: In spite, Twitter API allows to return up to 100 retweets, it usually return only latest retweets during last random timing frame.

2. New style retweets track only first level. Example:

   @bob: My Awesome application http://bit.ly/1234

   @alice: RT: @bob My Awesome application http://bit.ly/1234

   But if @eve RT @alice retweet, the message will be similar to alice's and she won't be mentioned in it.

   @eve: RT: @bob My Awesome application http://bit.ly/1234

The old style was (not in use anymore): RT: @alice: RT: @bob My Awesome application http://bit.ly/1234

Important! There is some Twitter API limit https://dev.twitter.com/docs/rate-limiting/1.1. OAuth-enabled application could initiate 350 GET-based requests per hour per access token.