15. A computer implemented method for subscribing a page to annotated content, comprising: receiving from a first user a first set of keywords for annotating annotated content from a second user; receiving from the first user a second set of keywords that designate whether annotated content annotated by at least one keyword included in the second set of keywords is shared with the second user; receiving via a client system, which is associated with the second user, a keyword selection for a select keyword that annotates a select piece of content; receiving via the client system a request to subscribe to annotated content annotated by the select keyword; and subscribing a page associated with the second user to the select piece of content annotated by the select keyword if the content of the second user is annotated by at least one keyword in the first set of keywords and if the select keyword is in the second set of keywords.
15. A computer implemented method for subscribing a page to annotated content, comprising: receiving from a first user a first set of keywords for annotating annotated content from a second user; receiving from the first user a second set of keywords that designate whether annotated content annotated by at least one keyword included in the second set of keywords is shared with the second user; receiving via a client system, which is associated with the second user, a keyword selection for a select keyword that annotates a select piece of content; receiving via the client system a request to subscribe to annotated content annotated by the select keyword; and subscribing a page associated with the second user to the select piece of content annotated by the select keyword if the content of the second user is annotated by at least one keyword in the first set of keywords and if the select keyword is in the second set of keywords. 16. The method according to claim 15 , further comprising determining whether the annotated content of the second user is annotated by at least one keyword in the first set of keywords, and whether the select keyword is in the second set of keywords.