When attaching an image to a post on SoAmpli, the file size limit is 3MB.
In general, the best image size for each network are:
Facebook – 1,200 x 628
Twitter – 1,024 x 512
LinkedIn – 700 x 400
Instagram – 1,080 x 1,080
Two sizes that usually work well in general for social media sharing are:
Landscape – 1,024 x 512
Portrait – 800 x 1,200
These are subject to change as the social networks often update their guidelines.