Suppose I have a blog that I run on free blogging platform like blogger or wordpress and have domain like.....http://mysitename.blogspot.com or http://mysitename.wordpress.com and if at any point of time I decide to buy the domain and host it from any hosting service......I mean to say I need it to switch to http://www.mysitename.com then will the page rank of my blog or SERP ranking will have any effect. I mean to say I just change from free hosting to paid hosting without changing any content. Plz Help me guiding about this issue.