to compare your entries in the Contacts app with the Twitter accounts you follow, so that it can update matching contact cards with relevant Twitter usernames. Sending regular Tweets If want to you use Twitter as a direct messaging service, tap a contact's username followed by Tweet, to send them a message. By default their username will be preceded by an @, so everyone who follows both them and you will be able to see what you've written. If you want to keep the message private, replace this with a D to send a direct message. If, like us, you've setup more than one Twitter account, tap the From line to switch between them. Keep an eye on the number in the lower-right corner of the entry card, which shows you how much of your 140-character limit remains. Tweeting photos The Photos app can directly tweet your snaps, handling both the upload and linking them to a message. Images are uploaded to Twitter's own servers and stored at pic.twitter.com. To tweet a photo, open the image you want to use in Photos and tap the toolbar's shortcut button (the rectangle with the arrow curling out of it in the bottom left). Select Tweet and type the message you want to use to accompany the image, which itself will be attached to the tweet as a paper-clipped thumbnail. Note that the number of characters at your disposal will be lower than Twitter's default 140, as some have already been consumed by