Using the right images is essential when creating posts on social media. As you'd expect, there are some restrictions.
Facebook:
Cover image: 820 x 312 (minimum 400 x 150)
Profile image: 180 x 180 or greater
Shared post image: 1200 x 630
Shared link preview image: 1200 x 628
Event image: 1920 x 1080
Twitter:
Header image: 1500 x 500 | maximum 5 MB
Profile image: 400 x 400 | maximum 2 MB
In-stream image: 440 x 220
LinkedIn:
Banner image: 1584 x 396
Profile image: 400 x 400 (minimum 200 x 200)
Company Cover image: 1536 x 768
Shared image: 350 pixels wide
Shared link preview: 180 x 110
Company logo image: 300 x 300
Company cover image: 1536 x 768 (minimum 1192 x 220)
Company page banner image: 646 x 220
Square logo (appears in company searches): 60 x 60