Hi... I'm still new to the Mac systems "in laptops" I have a Macbook Air, few days ago my friend brought me her broken iPhone 5S, to back it up in my MBA before restoring it to factory settings and selling it. I did the backup, and I imported all her 3000 something photos in iPhoto. today I opened my Plus, and found around 300 pictures from my friend's iPhone in the "Recently Added" and around 200 more from my old iPhone 5 I had to select them manually and delete them now how can prevent this from happening again? I had my iPhone connected yesterday but I didn't get any message or notification about this pictures getting copied to my Plus. I don't want to get like 3000 pictures or more the next time I connect my Plus to my MBA then I will select them one by one and delete them and how can I find the imported pictures by iPhoto to copy them in a flash drive? and let's say if I imported pictures from 3 iPhones, will all the pictures be mixed up?? Sorry.. still getting to know these stuff.