Do you notice any remarkable changes on weekend in traffic referred by StumbleUpon? Or is it about the same as other days? In my case it went down for more than half from Friday and I am wondering if the reason is just hollidays in the US or is any other reason. Thank you
Traffic always fluctuates based on time, whether it is holidays, weekend, morning or night. It's just how the world works. So there is not even a need to ask if StumbleUpon traffic changes during the weekends. And no one can answer for you, except yourself, whether it goes up or down during weekends except for overall, general trend. However some sites will get a lot more traffic from SU during weekends, while some may get almost zero. It all depends upon many factors, including your site niche.
I actually speaking, I never get more traffic from stumbleupon, but I heard lot of guys are talking that they are getting more traffic from it. But I do get from delicious. Traffic from delicious.com is always "delicious"