Here’s a great post with 19 daily tasks for various social media platforms… 5 for Twitter, 6 for Facebook, 5 for LinkedIn, and 4 for blogs. Understand that Chris Brogan is a pioneer in this space, and doing this has been a part of his job descriptions over the years (afaik)… doing all of these regularly (even weekly) might be way to much for the average mortal.
Nonetheless, there are great suggestions you can implement. I don’t necessarily disagree with any of them, although I’d suggest and alternative to his 15th point (the last one in LinkedIn) …. only put slideshows or books that are relevant to your branding message, not distracting at all. Don’t need to add more noise to your LinkedIn Profile.