Official Web Master Blog

Twitter Cards are expanded Tweets that display content in a more engaging and detailed format. Twitter cards make it possible for you to add media to Tweets that link to your content.
By adding Twitter Card markup you could increase your followers and SEO because it make an attribution to your Profile and Backlink to your Site or blog
There are 7 type of card that can be attached to twitter, each of them work beautiful on both web and mobile apps

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