URL Shorteners like goo.gl provide an easy way to send long URLs that look short and neat. However, these URL shortening services are often misused to create spam links. The original spam URL is shortened using one of the shortening services and sent so it looks legitimate.
If you receive a shortened URL from an unknown source, it is recommended that you check the URL and see where it leads to. Looking at the original URL, we can usually recognize if the destination URL is spam or not. One such tool to find the original (long) URL is LongURL:
Another alternative to LongURL is URL Expander – urlex.org. These are useful tools that help to deshorten / expand URLs and see where what the actual destination URL is.