In addition make sure you add the parameter include_rts=1 to the request.
The include_rts flag instructs the API to include retweets in the response.
Looking at the timeline you requested it looks as if the last 20 Tweets by that
user are retweets - which, by default, are not included in the tim
It should be pointed out that those aren't valid API URLs..
You want to execute these requests against API.twitter.com/1/resource...
The best way to construct your URL would be like this: (it reduces
ambiguity)
https://api.twitter.com/1/statuses/user_timeline.json?screen_name=justinbieber&count=
