Yes, blurring the faces or putting a big sticker on top (I've seen this done by fans from Japan) would be an easy solution for group shots. The easiest would be to refrain from posting fan photos at all, of course, but it seems Fanlore has made up its mind there.
Two examples how the right to one's own image is protected. Most European countries handle that similarly. If I am in a big group in a decidedly public setting or, for example, I'm one of a handful of anonymous tourists next to a public monument or landmark, things are different, but fannish conventions are often private spaces, and the pics that we are talking about are taken specifically of the people depicted, not of the architecture, so uploading photos without consent of the depicted can lead to lawsuits. I, for once, WOULD SUE.
no subject
As for the laws:
https://de.wikipedia.org/wiki/Recht_am_eigenen_Bild_(Österreich)
https://de.wikipedia.org/wiki/Recht_am_eigenen_Bild_(Deutschland)
Two examples how the right to one's own image is protected. Most European countries handle that similarly. If I am in a big group in a decidedly public setting or, for example, I'm one of a handful of anonymous tourists next to a public monument or landmark, things are different, but fannish conventions are often private spaces, and the pics that we are talking about are taken specifically of the people depicted, not of the architecture, so uploading photos without consent of the depicted can lead to lawsuits. I, for once, WOULD SUE.