Answerbag, shortly known as AB, was the second biggest question answers site after Yahoo answers and the first ever question answers website in English. It was started in the year 2003 by AB-Joel. He sold the website to InfoSearch Media in 2006 and the InfoSearch Media sold the website to Demand Media in the same year. I'm not sure about if anyone later bought it from Demand Media or not.
The website had a competition from the newly started similar sites but it remains the 2nd~3rd place in the QA sites. But it was closed last year suddenly in December 2015.
Similarities with Sodahead
Both sites closed in the same year, 2015.
No prior notice to the members about the shutdown.
Both had a lot of active users who later become the refugees on other sites.
Sometimes acquisition of a website/product by a new company helps to improve the service (acquisition of Youtube by Google) and sometimes it can be a end to the website.
Do you think 'lack of money' or 'to earn money in short term' is the reason behind the closer of popular sites. Do you think the sites like Yahoo answers will be shut down in the future?