Random fan blogs, Instagram and twitter accounts are not a source as long as the fans didn’t take the pics by themselves.
And “saved on my phone” is also only a source if you shot the pic yourself.
Please people, source your pics and edits.
It’s not just the only respectable thing towards the artist but also the best way for fans to find the highest resolution pics possible. Sometimes I try to add sources to someone elses post but it gets harder and harder to find the originals because of so many unsourced and uncredited edits floating around. If you appreciate not only the artist seen in the pics but also the artist who actually took the pic and gave you access in the first place, then try to find the original post and add the infos to your uploads. Imagine your admired person in the pic treated the same as the people who upload original content. It’s an impossible scenario because then you’ve mostly never heard of them!
Treat artists with respect. The ones in front of the camera and also the ones behind the camera.
And to take it one step further: it’s best to avoid paparazzi pics where they invade the personal life of people for the sake of money.