Wikipedia is one of our most-used information sources, yet women are woefully unrepresented. There have even been incidents like the systematic removal of female authors from the category of "American novelists" and placement of them into "American women novelists," because there are people and there are women and those don't overlap, right?
There is a meetup on February 1st to do a mass edit-a-thon. There are sites all over the place, you can start your own, or if all else fails you can take this as an inspiration to edit an article or five. I would hope that we could be even more specific and especially examine articles about WOC, women's class- and ability-related topics, and others.
The site sums it up best:
Wikipedia's gender trouble is well documented: in a 2010 survey, Wikimedia found that less than 13% of its contributors are female. The reasons for the gender gap are up for debate: suggestions include leisure inequality, how gender socialization shapes public comportment, and the contentious nature of Wikipedia's talk pages. The practical effect of this disparity, however, is not. Content is skewed by the lack of female participation, with more articles on notable women absent on Wikipedia in comparison to Encyclopaedia Britannica. This represents an alarming aporia in an increasingly important repository of shared knowledge.
Please consider taking part, and sharing this far and wide!