[mtajim]

Social Bookmarking is an easy way to get backlinks for your sites , besides if you get into top page of such sites then you can huge traffic that can even eat all of your bandwidth

[StarLab]

Eating up all your bandwidth would fall under the category of "Good Problems" :)

If you reach that level, hopefully you're getting enough ad clicks to purchase additional bandwidth.

[Jerlene]

I receive a lot of clicks but I never purchase more bandwidth. It's just hard to find a good company and I don't want to stick with my current host for too long.

[mattt]

Social bookmarking is the best way to get more traffic very next to the search engine. I love social bookmarkings and the traffic i get from them. The revenue generated through the traffic from social bookmarkings too are really good when compared to other generic traffic. Might be something to do with young fellows who stumble to our sites or blogs to social bookmarkings!

[DayDreamer]

i use these to get traffic and increase Page Ranking.
For me the best among are Stumble upon, digg and del.icio.us

[Subesh]

StumbleUpon is probably the best one to use out of all the other ones because it is proven to bring in a high amount of traffic, where the others bring in an okay amount.

[StarLab]

I find the retention of people visiting through these services to be disappointing. It's just hit n' run traffic which doesn't seem to convert well. They never comment, click ads, or even stick around to look at other posts.

Just a quick burst of traffic is about all I've ever seen.