Spam in blogs (also called simply blog spam, comment spam, or social spam) is a form of spamdexing. (Note that blogspam also has another meaning, namely the post of a blogger who creates posts that have no added value to them in order to submit them to other sites.) It is done by posting (usually automatically) random comments, copying material from elsewhere that is not original, or promoting commercial services to blogs, wikis, guestbooks, or other publicly accessible online discussion boards. Any web application that accepts and displays hyperlinks submitted by visitors may be a target.