<prompt> Translate the following text to EnglishKununua tangazo ambalo labda liligharimu chini ya 1,000, na kusababisha karibu watu 100 kujitolea kibinafsi, hiyo ni mwingiliano wa kweli.  <response>: An ad buy that probably cost less than 1,000 prompting nearly 100 people to volunteer in person--thats true interactivity. 