Pros:
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Reach an audience based on trending topics in news, sports, entertainment and many other topics with targeting capabilities by trending hashtags and keywords.
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Cons:
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Not optimal for conversion goals
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Best Practices:
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Develop creative for mobile - 80% of Twitter's audience uses mobile app and web to access the platform.
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Creative should be updated frequently to tailor to Twitter's constant updated content - adjusting copy and imagery/video on a weekly basis throughout the flight can drive better engagement.

Specs
Video Website Card
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Tweet copy - 280 characters (Note: Each link used reduces character count by 23 characters, so for example, using one link would leave 257 characters for Tweet copy.)
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Website title length - 70 characters.
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File size- For optimal performance, keep files under 30MB. Max 1GB
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Video length - Recommended: 15 seconds or less
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Branding: Highly recommended throughout; if using a logo, it should be persistent in the upper left-hand corner.
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Captions: Closed captioning or text overlays are mandatory.
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File types- MP4 or MOV
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Video bitrate recommendation - Recommended: 6,000k for 1080p, 5,000k for 720p
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Frame rate recommendation- 29.97fps or 30fps.
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Aspect ratio - 1:1 is recommended as it will always render as square on desktop and mobile, timeline and profile. This and 9:16 (vertical) will take up the same amount of real estate — which is more than 16:9.
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Recommended size - 1200x1200 (minimum for 1:1 is 600x600)
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Thumbnail - Supported files: PNG or JPEG
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Aspect ratio: recommend matching sizing of the video
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Max size: 5MB
Image Website Card
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Tweet copy - 280 characters (Note: Each link used reduces character count by 23 characters, so for example, using one link would leave 257 characters for Tweet copy.)
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Website title length - 70 characters. Please note — depending on device and app settings this description may truncate. Although not guaranteed, limiting the description to 50 characters should ensure that truncation won’t occur across most devices.
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Image size - 800x418 pixels for 1.91:1 aspect ratio (max 3MB), 800x800 pixels for 1:1 aspect ratio (max 3MB)
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File types - PNG and JPEG (no BMP or TIFF files)
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Custom header - Enter your own customized header to tell people what you want them to do when they see your ad.