14. A system, comprising: a computer comprising a processor and a memory having computer-executable instructions stored thereupon which, when executed by the processor, cause the computing device to: receive a request from a web browser for an anchored annotation associated with particular content; retrieve anchored annotations associated with the particular content; provide the retrieved anchored annotations; and provide a visual indication about content change of anchoring text within the particular content when a match score is less than a threshold, wherein the visual indication comprises stored original text displayed with the anchored annotation.
17. The system of claim 14 , the memory having further computer-executable instructions stored thereupon which, when executed by the processor, cause the computing device to: filter the retrieved anchored annotations based on a user identifier associated with an annotation author.