if you need to bookmark a site and want to have a copy of your bookmarked sites accessible from any computer- it's free and very easy to use. LiveBinders is like having a 3-ring binder for the Web- collect your resources, organize them easily, present them to your students/colleagues. Your students can access them from the laptops simply by going to the site and searching for your public binder by name, or by logging in with your information. You can make your binders private or public. There are hundreds already made that you may be able to use in your classroom (someone else has already done the work for you) - if it is public you can make a copy of it and save the binder in your account!
Excellent Livebinder with resources for rationale for building a PLN, tools and ways to find other educators to connect with.. Created by an Evansville educator
This blog entry from Steven Anderson highlights some of his favorite livebinders (and he's somewhat of an expert). There are also other valuable posts on his blog.
Elaine Plybon's livebinder on social media use in the classroom. This includes sites that simulate social media tools. I attended a webinar she presented on 4-14-12