Twitter today updated its iOS app, adding search improvements that include additional topic and user suggestions when searching and Top Tweets from important events. The update also removes support for video services from Mobypicture, Vodpod, and Posterous, leaving Twitpic as the last remaining video uploading service for the iOS app.This update includes enhancements to search and other improvements. -As you search you'll see more topic and user suggestions for your query, based on what's happening in real time. You'll also see these suggestions when adding a hashtag or username as you compose a new Tweet. -Top Tweets from big moments in the past pop out when you search for a given term. For example, searching for “election” might highlight Tweets from several months ago.