Today, seeing AskUbuntu, it seems that spam is getting frequent, 30 minutes a spam thread is being posted. The most recent one was about "making people to look younger". The first one i saw today was about a game..
Spam comes randomly. Sometimes nothing for a week, sometimes dozens within a single hour.
Maybe somebody who really tries to get some people click their links thinks that their chances are higher if they send a wave of spam posts, maybe it's just coincidence.
As long as it gets back to a lower rate after an hour or a day again, there's nothing to worry. We've handled all spam waves successfully in the past and will continue to do that in the future!