This Web app lets you pass on some good vibes to strangers on Twitter who are having a bad day.
Aptly named Cheer Upper, it culls the social media platforms for depressed tweets, using the Twitter API and MetaMind's sentiment analysis API.
Once these tweets are found, users are able to reply to these people to brighten up their day. If you are having a bad day and need some cheering up yourself, you can add #cheermeup and you most likely will get a response from the good people on Twitter.
Visit the website to help make the day brighter for a stranger.
[via The Daily Dot, Cheer Upper]