Decent Social bookmarking exchange sites!

I see loads of social exchange site listed on here by searching forums, but they all seem to only exchange facebook likes, Google+ and twitter. Are there any like Socialadr.com which you can exchange other bookmarking sites like reddit, stumbleupon, delicious and others.

I like socialadr.com but its very restricted on how many credits you can earn in a day, so are there any others?

can socialadr.com give you instagram likes?
Also use addmefast for fastest results!
I use it basically everyday
unlimited credits