Facebook artists
A: Aaron Westerberg / Adofolo Gutierrez (Fito)
B: Barbara Hulme
D: Denis Sarazhin
J: John Murray
M: Michael Rollins
N: Nick Runge
S: Sebastian Alberto Chelia
V: Vladislav Yeliseyev
Galleries
Barbican / Barbican Art Society / Tate Gallery / Dulwich Picture Gallery / ICA-International Contemporary Arts / Whitechapel Gallery / Saatchi Gallery / Hayward Gallery / Southbank Centre
Instagram artists
E: Eric Luke
H: HenryYanArt
Museums
British Museum / Victoria & Albert / Courtauld / Science museum / History museum / The Royal Academy Of Arts / The Wallace Collection / The Wellcome Collection
Origami
Poetry
Individual artists
American
The Museum of Modern Art: MoMa.org
Roy Lichenstein: Lichenstien Foundation
Dutch
Van Gogh: VGGallery / VanGoghLetters.org
English
Banksy: Artsy / Banksy / Britannica
Turner: Britannica / National Gallery / Tate(1) / Tate(2) / Royal Academy / WikiArt / Wikipedia.org
French
The Louvre: Louvre.fr
The Pompidou Centre: Centre Pompidou
Camille Claudel: museecamilleclaudel.fr / Wikipedia.org
Delacroix: musee-delacroix.fr / Project Gutenberg / National Gallery / TheArtStory / SmartHistory / Britannica / WikiArt / Wikipedia
German
Kathy Kollwitz: Kollwitz.de / WikiArt.org / MoMa.org
General
Google Arts And Culture: Arts and culture (google)
WikiArt: Artists by Art movement
Project Gutenberg: Gutenberg.org / Wikipedia.org
Jordan
Jordan: National Gallery.org (JNGFA/Jordan National Gallery of Fine Arts) / National Gallery.org/collection
Spanish
The Prado Museum: museodelprado.es
The Royal Collections Gallery: patrimonionacional.es
Museum Reina Sofia: mseoreinasophia.es
Picasso: museupicassobcn.cat / museoupicassomalaga.org