Here in this I post will be a helpful guide on the image sizes for different social media platforms.

Facebook Image Sizes

https://www.facebook.com/business/ads-guide/image/facebook-feed/traffic

Facebook Ad Formats: Depending on your Campaign Objective, you can select varying formats for your ad.

• Image – Ad Specs and Facebook Images Guide
• Video/Slideshow – Ad Specs and Facebook Video Guide
• Carousel – Ad Specs and Facebook Carousel Guide
• Collection – Ad Specs and Facebook Collection Guide
• Instant Experience – Ad Specs and Facebook Instant Experience Guide

Instagram Image Sizes

• Landscape Image Size: 1200 x 628 pixels (1.9:1)
• Square Image Size: 1080 x 1080 pixels (1:1)
• Vertical Image Size: 600 x 750 pixels (4:5)

Design requirements for Instagram feed ads: https://www.facebook.com/business/help/430958953753149?id=1997185213680277

Twitter Image Sizes

• Twitter Profile Photo: 400 x 400 pixels
• Twitter Header: 1500 x 1500 pixels

Creative Ad Specs: https://business.twitter.com/en/help/campaign-setup/advertiser-card-specifications.html

Pinterest Image Sizes

• Pinterest Profile Photo: 165 x 165 pixels
• Pins: 1000 x 1500 pixels (2:3) [Pinterest Recommendation]

Pinterest Product Specs: https://business.pinterest.com/en/Pinterest-product-specs

YouTube Image Sizes

• YouTube Channel Art (Cover Image): 2560 x 1440 pixels
• YouTube Thumbnail: 1280 x 720 pixels