Die #newprofiles-Maße: 400 x 400 und 1500 x 500
If you're updating to the #newprofiles, image dimensions are 400 x 400 for a profile photo, 1500 x 500 for a header. https://t.co/djOFTfMl0z
— Twitter Support (@Support) April 8, 2014
Na, dann fange ich doch schon mal an, mir was zurechtzupixeln...