I submitted one post from site to stumbleupon. I got around 40,000 views on that page. Because of this heavy load my website server went down. The website was back online in around 8 hours. But I dont see any traffic from stumbleupon now. (Which was around 4000 page views daily from last 10 days)
Does this mean that my website is in blocklist from stumbleupon as it was offline for around 8 hours?