Joined: 19 Jun 09
02 Jun 10 7:29 pm
Both of them are good for your site. you should use them both.
they each have a different following of users, so you get a wider base of customers finding your links.
make sure you take time to add value to the sites, dont just spam your own links. log in once a week, and comment on other sites, make friends requests, and boost the posts made by other people. Just using these sites for a back link is leaving money on the table.
Check out my latest blog post, I have a video on starting social bookmarking
, and I use Digg as the example in the video.