Why are there so many spam adverts all of a sudden?

In the last couple minutes, loads of those spam ads have appeared around all the websites I'm on, like Facebook, twitter, Google and this website. The ads are like how to lose weight in 5 mins, chat requests, and the games like shooting the iPhone. Happened really suddenly and wanna know if there's a way to get rid of it or if its a virus or something, thanks!

Added (1). Pop-up ads are and have always been disabled!

Make sure your browser has the pop up adds disable set.

If you're using Firefox install the extension AdBlock Plus.

BTW, if you think an ad is not appropriate or misleading, please do report it. It helps keep the community clean for everyone.

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