Social media platforms like Facebook, Instagram and Twitter, are always updating their image formatting and layout options. If you are not paying attention to these updates, the way your images appear just won\’t fit right. or they will appear pixelated. It makes it look poor and unkempt, regardless of how good your content is on that social platform.
This is why you should always be reviewing the visuals on your social media profiles.
If you’re not interested in displaying blocky, pixilated images for your profile logos that don’t fit the frame anymore, then you’ll want to check out the infographic from Hootsuite. Hootsuite has a regularly updated guide that shows the key image dimension data for every major social platform.

Source – Social Media Today