According to Google's Safe Browsing Diagnostic Page advisory:
The last time Google visited this site was on 2014-01-13, and the last time suspicious content was found on this site was on 2014-01-13.
Malicious software is hosted on 1 domain(s), including diverge.ws/.
Has this site acted as an intermediary resulting in further distribution of malware?
Over the past 90 days, stumbleupon.com appeared to function as an intermediary for the infection of 1 site(s) including su.pr/.
If you ever thought that the internet is starting to get boring this site will save you. I'm never bored surfing while I'm using it, there's so much content for any interest you might have and you can easily discover new sites you would have never even consider searching for.
Ive never been to the main site and I suppose it is a good site from the reviews. I have found alot of times they are 3rd party scripts loading in other websites. I dont use them or care about them so I block them.