Twitter has said it's testing Promoted tweets for logged out users. According to twitter, many users follow links from search engines, etc., but are not logged in. According to twitter, this significantly extends the audience for advertisers to over 500-million. In simple terms, this, potentially, opens up millions of additional viewers of promoted tweets.
Initially this test will support campaigns driving website clicks or conversions, or video views. To start, these Promoted Tweets and Videos will appear on profile pages and Tweet detail pages on desktop web only.
We are rolling this out gradually with selected advertisers in the US, UK, Japan, and Australia with more geographies in the future. Twitter Tests Promoted Tweets for Logged Out Users [blog.twitter.com]