What do they do?

[Fruengalli]

So what algorithms do Flickr, Insta etc apply. For me Flickr seems to really add sharpening.

[farmmax]

I've never checked my Flickr ones, but with Smugmug you get the choice of how much sharpening you want applied to your photos. Does Flickr do the same?

[Fruengalli]

I've never checked my Flickr ones, but with Smugmug you get the choice of how much sharpening you want applied to your photos. Does Flickr do the same?

No ...no options at all.