Hey - we had Social Bookmarking for PHP-Nuke first!  OK, so we didn't have blocks.  But we do now!  In fact, there are 3 - one with vertical large images, one with vertical text links, and one with small, horizontal images.  Of course you aren't limited to 3 social bookmarking sites - you can choose from 6 (carefully selected to maximize search engine placement), and add or remove as many as you like.

Enjoy...  Download it here.  Note:  Requires nukeSEO Social Bookmarking, which has also been updated to include the blocks.  Get the full download here.