Stuble upon & Digg

can any one tell me,
does stumbling & Digging & other socializing activities like these,
do they really help us to get good targeted traffic

Yes digg and stumble is very useful to get traffic for your site. I am getting lots of traffic using stumble and diggs. I would prefer to go with stumble first and one more service propeller is good too.

for traffic stumbleupon and digg are great, you can buy some stumbles or trade stumbles (if you find some people does want to do it with you) .

Are they Good targeted Traffic? Not from Stumble. Stumble traffic is more generic. Digg traffic is better because people are choosing to click on your article.