identi.ca is an open source social networking and micro-blogging service. Based on StatusNet, a micro-blogging software package built on the OStatus (formerly OpenMicroBlogging) specification, Identi.ca allows users to send text updates (known as "notices") up to 140 characters long. While similar to Twitter in both concept and operation, Identi.ca provides many features not currently implemented by Twitter, including XMPP support and personal tag clouds. In addition, Identi.ca allows free export and exchange of personal and "friend" data based on the FOAF standard; therefore, notices can be fed into a Twitter account or other service, and also ported in to a private system similar to Yammer.

The service received more than 8,000 registrations and 19,000 updates within the first 24 hours of publicly launching on July 1, 2008, and reached its 1,000,000th notice on November 4, 2008. In January 2009, identi.ca received investment funds from a Montreal-based venture capital group.^{[citation needed]}

A Doll's House (Norwegian: Et dukkehjem; also translated as A Doll House) is a three-act play in prose by the playwright Henrik Ibsen. It premièred at the Royal Theatre in Copenhagen, Denmark, on 21 December 1879, having been published earlier that month.

The play was controversial when first published, as it is sharply critical of 19th century marriage norms.Michael Meyer argues that the play's theme is not women's rights, but rather "the need of every individual to find out the kind of person he or she really is and to strive to become that person." In a speech given to the Norwegian Women's Rights League in 1898, Ibsen insisted that he "must disclaim the honor of having consciously worked for the women's rights movement," since he wrote "without any conscious thought of making propaganda," his task having been "the description of humanity." The Swedish playwright August Strindberg attacked the play in his volume of short stories Getting Married (1884).

UNESCO inscribed Ibsen's autographed manuscripts of A Doll's House on the Memory of the World Register in 2001, in recognition of their historical value.

Kurt Donald Cobain (February 20, 1967 – April 5, 1994) was an American singer-songwriter, musician and artist, best known as the lead singer and guitarist of the grunge band Nirvana. Cobain formed Nirvana with Krist Novoselic in Aberdeen, Washington in 1985 and established it as part of the Seattle music scene, having its debut album Bleach released on the independent record label Sub Pop in 1989.

After signing with major label DGC Records, the band found breakthrough success with "Smells Like Teen Spirit" from its second album Nevermind (1991). Following the success of Nevermind, Nirvana was labeled "the flagship band" of Generation X, and Cobain hailed as "the spokesman of a generation". Cobain, however, was often uncomfortable and frustrated, believing his message and artistic vision to have been misinterpreted by the public, with his personal issues often subject to media attention. He challenged Nirvana's audience with its final studio album In Utero (1993).

During the last years of his life, Cobain struggled with heroin addiction, illness and depression. He also had difficulty coping with his fame and public image, and the professional and lifelong personal pressures surrounding himself and his wife, musician Courtney Love. On April 8, 1994, Cobain was found dead at his home in Seattle, the victim of what was officially ruled a suicide by a self-inflicted shotgun wound to the head. The circumstances of his death at age 27 have become a topic of public fascination and debate. Since their debut, Nirvana, with Cobain as a songwriter, has sold over 25 million albums in the U.S. alone, and over 50 million worldwide.

Michael Joseph Jackson (August 29, 1958 – June 25, 2009) was an American recording artist, entertainer, and businessman. Often referred to as the King of Pop, or by his initials MJ, Jackson is recognized as the most successful entertainer of all time by Guinness World Records. His contribution to music, dance, and fashion, along with a much-publicized personal life, made him a global figure in popular culture for over four decades. The seventh child of the Jackson family, he debuted on the professional music scene along with his brothers as a member of The Jackson 5 in 1964, and began his solo career in 1971.

In the early 1980s, Jackson became a dominant figure in popular music. The music videos for his songs, including those of "Beat It", "Billie Jean", and "Thriller", were credited with transforming the medium into an art form and a promotional tool, and the popularity of these videos helped to bring the relatively new television channel MTV to fame. Videos such as "Black or White" and "Scream" made him a staple on MTV in the 1990s. Through stage performances and music videos, Jackson popularized a number of complicated dance techniques, such as the robot and the moonwalk, to which he gave the name. His distinctive musical sound and vocal style influenced numerous hip hop, post-disco, contemporary R&B, pop and rock artists.