I created two groups:

Millennials: The Next Greatest Generation?
https://groups.diigo.com/group/millennials-the-next-greatest-generation - 3 sites
www.mysliderule.com/learning-paths
www.lifehack.org/...will-find-useful-websites.html
paper.li/...1329613148 --shameless self-promo;)

College Search 101
https://groups.diigo.com/group/college-search-101 - 8 sites
www.collegefactual.com
admissionpossible.com/index.php
www.fastweb.com/college-search
diycollegeprep.wordpress.com/about
www.nytimes.com/...opics-education-navigator.html
www.collegescholarships.org/...top-100-education-advice-blogs
collegerealitycheck.com/en

and 2 lists:

Instructional
https://www.diigo.com/list/kgrill/Instruction/3cm2ksayp - 8 sites (Instruction)
ca.pbslearningmedia.org
www.uwstout.edu
www.greenwichschools.org
bie.org
www.learner.org
www.freetech4teachers.com
www.educatorstechnology.com
instructionaldesignfusions.wordpress.com

Technology
https://www.diigo.com/list/kgrill/Tech/3cjonu2s0 - 4 sites (Technology)
blog.bufferapp.com
teachertrainingvideos.com
www.educatorstechnology.com
blogs.kqed.org

I look forward to everyone else's discoveries--and using them.