I tend to limit my time on social interaction so that I can focus more on blog posts. I find that it takes me about a half an hour to earn just 30 points interacting, whereas I can earn 50 with a blog post in about half that time. I still try to interact with people and on the forums, though. Every point counts!
I agree with @stephanie_c. I try to write more blogs. It’s faster and more efficient to get points. Although, when I’m “tired” of writing, thats when I go to the forums…