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All banners should be saved on an HTTPS server to ensure viewability. This includes third party tags, JPEGs and HTML5 files.

Twitter sponsored post

Name Twitter sponsored post
Dimensions Image 1200px x 675px or 1200px x 1200px. Video 1200px x 600px or 1200px x 1200px
Accepted files JPG/PNG or MP4/MOV/GIF
Max.Size Image 5MB. Video 1GB.
Notes Formats include text, image/GIF, carousel (up to six images/videos), video. Copy 280 characters. Each link used reduces character count by 23 characters, electing 257 characters for Twitter copy. 
Copy deadline One week prior to launch date
Devices Desktop Ads   Tablet Ads   Mobile Ads

Facebook sponsored post

Name Facebook sponsored post
Dimensions 1080px x 1080px
Accepted files JPG/PNG or MP4/MOV/GIF
Max.Size Image 30MB. Video 4GB.
Notes Primary text: 125 characters, headline: 40 characters, and description: 30 characters. Video captions and sound: optional, but recommended. Can also include a carousel of two to ten cards 
Copy deadline One week prior to launch date
Devices Desktop Ads   Tablet Ads   Mobile Ads

LinkedIn sponsored post

Name LinkedIn sponsored post
Dimensions 1200px x 627px
Accepted files JPG/PNG or MP4/MOV/GIF
Max.Size Image 5MB. Video 200MB.
Notes Intro text: Up to 150 characters. Headline: Up to 70 characters. Can include a single image, carousel (multiple images) or video. 
Copy deadline One week prior to launch date
Devices Desktop Ads   Tablet Ads   Mobile Ads