Facebook's app for iPhone has come on leaps and bounds since it was first introduced. Now, not only does it allow you to access your Timeline (the new-look profile which was made available to all users in December this year) it also ensures you can upload photos and comment on and like those photos as well as images belonging to your friends.
At present, Facebook's iPhone app lets you tag someone in the image when you upload it and it also lets you go back and tag an image that has been previously uploaded, provided the photos are ones you have posted to the site and not by another social networker. Here's how to tag a photo using Facebook for iPhone
To upload and tag a photo using your Facebook for iPhone app, launch the app and then tap the Menu button in the top left-hand corner of the app.
From the option displayed, select photos, which will display a list of all the albums you have uploaded to the social network. Now select the + icon in the far right-hand corner and from the upload choices select Photo.
Now select whether you want to capture a new image or using one that's already stored on your iPhone. To tag the image simply tap on the person and then type their name. Press the Upload button and your photo will be uploaded to Facebook.
If you want to tag a photo you have previously uploaded to Facebook, then browse through your photos and tap on the image you want to tag.
Select the arrow located in the right-hand corner and from the options displayed choose Tag photo. Begin typing the name of the person you wish to tag in the image and then select the correct person. Your tag will now be saved.