All webmasters are crazy to get good quality links and can do anything to get their page rank improved and as per Google eyes it increases when you get quality backlinks.
It’s undeniable that Angela’s backlinks is one of the most effective methods to build backlink to your sites and help generate traffic and push your sites up to top on Search Engines.
Paul and Angela links are generally DOFOLLOW links and one get approx 30 methods of gaining links through profile building or leaving comments and these sites are generally PR 3-7.
God Knows whether Google gives credit to these links or not or may penalise the website for going for black hat SEO route as these are unethical links being created. Thus one has to be very careful in this aspect else one may be basking in the glory of a high page rank and may suddenly find it becoming Zero. Thus best is the natural link building and one should write quality content which auto forces other webmasters to refer.