Devs,
Before today calls to statuses/replies [1] would return only tweets
that were prefixed with a @username. As clients began to recognize the
value in mentions of a @username anywhere in the tweet, they opted to
perform a search for @username to get the superset.
Twitter agrees [2] that the definition of a reply has changed, and as
such, calls to statuses/replies contain any tweets that include a
mention of the authenticating user.
If your client has been using the Search API to retrieve @replies, you
should begin to migrate to statuses/replies method as it now best
practice.
1.
http://apiwiki.twitter.com/REST-API-Documentation#statuses/replies
2.
http://blog.twitter.com/2009/03/replies-are-now-mentions.html
Code on,
Doug Williams
Twitter API Support
http://twitter.com/dougw