The above said solution is good. You can also set all the blocks in profile page, photos page, video page and music page to be visible only to members and not to guests. Thus even if a guest opens a profile wid username in this manner www.yoursite.com/gkcgautam He would be shown nothing. Same is the case with other pages i mentioned. You can also create a block which wud be only visible to guests and you can write there that 'You need to login before using this page'