American Heart Association
http://cpr.heart.org/AHAECC/CPRAndECC/Programs/HandsOnlyCPR/UCM_473196_Hands-Only-CPR.jsp
100 bpm
https://www.youtube.com/watch?v=6GFTNEbu2FU
120 bpm
https://www.youtube.com/watch?v=-sZD0Avi8Qs
I just got recertified, and both the compression-only and the 30:2 methods were presented. The 30:2 method was still better than compression-only method, as you are providing more oxygen to the body than just compression-only, but the 30:2 method was only recommended when you had a breathing barrier, or if you were certain about the victim not having something that could eventually impact you. Otherwise it was compression only until either an AED kit (which should have a breathing barrier) or emergency personnel arrive.
"NOTE: The AHA still recommends CPR with compressions and breaths for infants and children and victims of drowning, drug overdose, or people who collapse due to breathing problems."