I follow a Twitter page called @OneMinuteBriefs. They post daily quick briefs on their page and ask followers to come up with a quick ad. The best ads are selected as winners. I have submitted quite a few ads to them, below are the two most popular in terms of favourites and retweets.
Twitter page:
https://twitter.com/OneMinuteBriefs
My Twitter page: https://twitter.com/reyalisations
Ad links:
https://pbs.twimg.com/media/B_01i4UU8AA3Opt.jpg
https://pbs.twimg.com/media/B9A64dWIYAAugIN.jpg
The first ad is for #NoSmokingDay.
The second ad "Cancel Cancer" is to promote unity against Cancer.
