Short URL services which are spreading these days actually started becoming a free tool for these spammers to hide the potential harmful link by converting into a short URL. However there are various methods which can used to check before whetherthese links are potentially safe to click, lets discuss them one by one.
Scan Suspicious Links With AVG Link Scanner
AVG Link Scanner is free utility from same company which distribute popular free antivirus AVG Antivirus FREE Edition. This program lets you scan any link and will tell you whether that link is safe to be clicked.