Wa alaikum assalam
Firstly, my approach is not 'Quran-alone'. I have always stated that it is best described as
'Quran-centric'. Secondly, my writings are replete with strong criticisms against new-fangled 'Quran-only' doctrines and my concerns with how segments from those that claim to follow the Quran interpret it. Some abandon Quranic rituals, forgo fasting, reinterpret basic words and in the name of logic, apply the most outlandish interpretations. I have even inferred that they could almost be following a different religion, in my humble view far more distinct and further from the truth than traditionalists.
Thirdly, I cannot comment on the sample of 'Facebook people' (as you describe as 'some'). I don't know them. I don't know their backgrounds or their journey with the Quran. Only God knows best. What I do know are many whose faith has become strengthened, especially in the dire moments of spiritual weakness with a Quran-centric approach.
Finally, only God can guide. Please always remember that.
I have also answered your question on another thread below.
http://quransmessage.com/forum/index.php?topic=1718.0I hope this helps, God willing.
Regards,
Joseph