Below are the things to consider before using these URL shortening services:
Various URL shortening services use different HTTP redirects. If you want your tweeted links to produce link credit for your site, use a service that issues a 301 redirect.
This redirect is a permanent one, and search engines will find links to short URLs and credit all links to the long URL. On the other hand, 302 redirect is a temporary one. It allows search engines to assume that the short URL is the original URL.
Spammers also use short URLs for malicious purposes. For example, they use it to direct the user to a pornography site, to hide malicious downloads or spyware. Find one of the best URL shortening companies that will eliminate the malicious shortened links.
Few email marketers find shortening links great. This is true for those who send plain text emails. In an HTML email, they can link any image or text.
The issue occurs when both a spammer and you use the same link shortener in the emails. If the multiple ISPs start blocking emails that have that link shortening domain, they may also block your emails.
Always pick a URL shortening service that has been around for a long time and has a good reputation for actively monitoring spam links.
Short URLs may consist of meaningless characters that both search engines and the audience won't find useful. It’s worth finding a short URL that you can tailor with a keyword.