both are good. i am using both. mainly it depends on your network on these sites. if you have good network on social media and social networking sites you may earn huge traffic
It is obvious twitter gives more traffic as compared to facebook.Increase your follower using software and also use site for automatic tweeting like rss2twitter, socialoomph Having 1000 follower means 150 traffic daily
book marking site is basically that site where you create your personal account and book mark or say submit your favorite or any other url which your like and want to be updated with every update made on that url
The answer is Facebook for me. Because too many announcements and marketing phrases on twitter that people on Twitter have become "ignorant". But facebook is way more personal and effective.
I don't think that has something to do with the subject of the thread... For me Facebook is much better but also more complicated, at least imo...