indyank - 4:36 pm on Jun 30, 2012 (gmt 0)
Contrary to what most people believe or say, Google has only enhanced their reliance on backlinks to the extent that they title pages in SERPS with what the anchor texts and other attributes of such backlinks suggest than relying on titles given to pages by their authors.
There is definitely a lot of merit in the argument that Penguin is a subset of Panda.Panda is definitely not an update that ignored backlinks in assessing page quality and hence it is not an "on page factors only" algorithm. Neither is Penguin a "backlink profile only" algorithm. But backlinks and their quality do play an important role in both the algorithms.