The SEO issue isn’t an issue, according to Google’s Matt Cutts. Using them ensures all parameters on the tracking link are transferred and parsed correctly for all platforms, browsers and scenarios.  It's possible to shorten regular custom links or OneLink URLs: Shorten Regular Custom Link You can use as many parameters as you'd like on a tracking link and use Shorten Link to convert the link to a short one.

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Twitter will use this to make your timeline better. Add X-Robots-Tag to my short links for granular control over how Google makes content available through search results. On Twitter and some instant-messaging services, there is a limit to the number of characters a message can carry – however, Twitter now shortens links automatically using its own URL shortening service, so there is no need to use a separate URL shortening service just to shorten URLs in a tweet. Perhaps, you can try improving your ad and then do A/B testing.

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We recommend choosing only one type of Google Analytics tracking. Edit short URLs or QR codes to fix broken pages any time I need it. Try again or visit Twitter Status for more information.Below are some frequently asked questions about t.co, Twitter's link-shortening service. Interestingly, that same infographic suggests that posting shortened URLs later in the week will give them a “longer lifespan”, clicking many days after it was posted.

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DyingLinks gives you control over how long you want your shortened link to be available, along with some other control and privacy features. There are security implications, and obsolete short URLs remain in existence and may be circulated long after they cease to point to a relevant or even extant destination. There are a lot of options for shortening your links, and some even provide additional services like link bookmarking and analytics on your clicks. The links are permanent, they will work as long as WordPress.com is around. Is there more than one type of Google Analytics tracking on your links?  If you combine MailChimp's Google Analytics tracking with custom UTM tracking, this could skew results in reports. Add X-Robots-Tag to my short links for granular control over how Google makes content available through search results.