While the term "blog" was not coined until the late 1990s, the history of blogging starts with several digital precursors to it. Before "blogging" became popular, digital communities took many forms, including Usenet, commercial online services such as GEnie, BiX and the early CompuServe, e-mail lists and Bulletin Board Systems (BBS). In the 1990s, Internet forum software, such as WebEx, created running conversations with "threads". Threads are topical connections between messages on a metaphorical "corkboard". Some[specify] have likened blogging to the Mass-Observation project of the mid-20th century.