Follow Liker question

Does anyone know if its possible to follow people who retweet a tweet of a specific user?

I know there's an option to follow who retweeted but it goes by keyword and not username

If @bob tweets something that gets 100 RT's, I want to follow people that retweeted @bob's tweet. Not the people that follow anyone tweeting about the keyword 'bob'.

any answers anyone??

Sometimes you need read fl help. Use users who liked or users who retweeted and put 'from:username'

I read it and found that out already. Thanks anyway.