Facebook is a social website for all age groups and have a strong brand presence. Google plus just starts, and in testing phase. and more importantly it's for businesses not personal sharing much. However it's too late to make a comment. Thanks
If u are looking for friends fans conversations then go for Facebook And in Google+ , as per Recent statics, there are very few ,to say more - the no. of people daily login are in single digits. where as in facebook , Millions of people are logging in every day staying for HOURS...