All networks are different and follow different rules when it comes to images sizes.
To prevent your images from appearing pixelated or not at all you should make sure to consider each network's individual requirements for image sizes. Images that are too large or too small might appear blurry or will not be posted at all.
Please also make sure that your images are in ".jpg" or ".png" format. For example, ".webp" image are not supported by a lot of networks.
Since the update to version 7.2.0, Blog2Social supports the optimized transfer of ALT metadata for your images (e.g. on Facebook, Twitter, Pinterest and Tumblr).If this data is stored in your media library, Blog2Social includes this data in your posts and forwards it to the above-mentioned networks.
Tags: image, size