See the official Nigerian election authority website for the latest updates in the delayed elections. The The Independent National Electoral Commission (INEC) also has official press releases, lists of candidates and information on procedures.
A number of Nigerian newspapers have online coverage of events see,.
Allafrica.com has a special section covering both the parliamentary and presidential elections.these include reports from local journalists. also look at the links on the left of the page for facebookk and other media pages covering the elections.
For Instance Reclaimnaija is using Ushahidi to map instances of electoral fraud and violence.
Sahara reporters has analysis and interviews.
Global voices online has some recommended tweeters to follow.