There are a number of Twitter clients available that allow you to upload photos directly to TwitPic and other Twitter photo-hosting services, but what if you don’t want to upload using a Twitter client?
Picture Tweeter does that job. It is a separate Android app that provides a very simple interface to upload photos to TwitPic and publish them on your Twitter profile with a tweet.
All Twitter users upload photos and for that, they use image hosting services like TwitPic, MobyPicture etc.
If you have a self-hosted WordPress blog and use Twitter a lot, you can turn your blog into an image host for your tweets and in return, get traffic on your blog.