13. The apparatus of claim 11 , being configured to read a header in the webpage that indicates the webpage does not permit modification, wherein the header includes an X-no-modify header.
11. An apparatus comprising: a host site including a networked computer system, the host site being configured to use the networked computer system to: determine whether a webpage permits modification; based on the determination that the webpage permits modification, compare a portion of text contained in the webpage to at least one character string stored in a database, the at least one character string respectively corresponding to at least one data item; based on the comparison finding that the portion of text contained in the webpage matches the character string stored in the database, modify the webpage by inserting the corresponding data item into the webpage, the data item linking the webpage with a different webpage, both the webpage and the different webpage being contained on the same website; send the modified webpage to a web browser of a user; correlate the portion of text contained in the webpage with a common name stored in the database; and communicate the corresponding common name to a producer of the portion of text contained in the webpage.