Micro-blogging service Twitter isn't just about 140 character updates, you can also share images on the site. There are a number of third-party services, including Twitpic and yFrog that allow you to do this. Earlier this month, it was revealed that Twitter has partnered with Photobucke to offer photo attachments to tweets directly from the Twitter homepage. However, this service isn't expected for a few weeks yet, so for now, here's how to use Twitpic to upload images.

Step one
Start by opening the Twitpic website in your browser. Click the Sign-in with Twitter button located at the top right-hand corner of the window. You'll be required to log-in with your Twitter username and password.

Step two
Once you're logged in click the Upload photo or video button. Click on the Browse button to trawl your hard drive and find the image/video you want to upload. You can also add text to accompany the photo in the tweet. Enter this in the box under Add a message.

Step three
Ensure the box next to Post to Twitter is checked. You can also choose to have your location displayed in the tweet. To do this, check the box next to Include location data (if available). Press upload. As soon as your picture has been posted to the micro-blogging site, it'll be displayed with your caption in the Window. Other Twitter users will now be able to see it too.

It's worth noting, you can also post images to Twitter direct from your mobile phone. You can either use the dedicated email address Twitter issues, which can be found on the right-hand side of the upload window, so send your picture to the micro-blogging service. Alternatively, if you have an iPhone , Blackberry or handset running Google Android, you can download the official Twitter client. This will allow you to 'share' an image simply by viewing it and then selecting Twitter form the share options on your handset.