Be careful when managing these resources. To be safe, remove all sensitive information and embarrassing photos. Even if you great control of privacy settings and your friend list, you never know how recruiters may wind up with potentially damaging information.
As to your blog – it can be a plus to mention that on your resume. At least a small percentage of the time, resume reviewers will visit your site. Make sure the content and site design are high-quality and leave a positive impression on visitors.
I’d be careful with tough-to-substantiate claims on your resume. If you state that you founded a private equity firm in college and a quick Google search for your “Rising Equity” PE fund shows a picture of 4 teenagers on a dumpy-looking website, you’re in trouble.