What's the best app for this?
My vote goes to ProfileAlbum.
|Yes, I blurred out my friends' beautiful faces|
- KakaoStory, (and, theoretically though I've never tried them)
- myPeople (how much longer will this remain a separate service?), and
- Naver Line
How It WorksWhen you view your friends' profile photos, the file gets saved in Kakao's cache folder. You could, in theory, go snooping through these folders with a File Explorer, but it would be annoying because they are stored in weird folder hierarchies with weird file names. ProfileAlbum consolidates them in a clean list, and let's you check-box the ones you want to save to a folder that your Gallery app can see.
So here is the key thing to note: YOU MUST VIEW THE PHOTO AS BIG AS YOU CAN FIRST. The apps don't "download" anything; they just grab what is in your cache already. Thus, you should be sure to view the person's full-size photo FIRST, THEN run the app to save it. Got it? So you can't use it to snoop on people you blocked (unless you unblock them real quick, view their profile photo fully, then block them again before they notice Bob's your uncle)
Note that for best results in KakaoStory, don't just view the picture in its "story"-- click it to get it individual and full-screen, so that the version with the largest possible resolution will be downloaded to your cache.