Make sure that each Web article you plan to cite has a complete list of works cited. This list should contain a reasonable number of printed sources to balance any online sources it may cite. If it is just a summary, use it to find the originals, but do not cite it as a source. Original sources always carry more weight than second-hand citations. If the information in a Web page is available as a print publication, it may be better to find and cite the printed version.
Print is a stabler medium than the Web.
Because Web pages are moved and deleted so often, future readers of your paper may not be able to find the Web version of the source at the same location where you found it. Another reason is that page number citations are more precise than page title citations. There are no page numbering conventions for Web sites, so parenthetical citations have to use just the title of the source. This makes it hard for readers to find the cited passages in the original.