Whenever I try to upload a .png with transparent background on Twitter I am getting a white background. I tried to upload different sizes (24x24, 256x256, 512x512) but it didn't help. It appears Twitter re-sizes the image and the transparency is lost.
However some other profile pics with transparent background (uploaded in 2011) are working just fine.
How do I upload an avatar with transparent background?
I don't really care about bigger pics (73x73). I just want my timeline profile pics (48x48) to stay transparent.