Hashmark is a free, social app that lets you anonymously post anything you want to everyone via #hashtags.
See whats going on around you and check out what #hashtags are trending in your area.
Posts disappear from each #feed in 24-hours, unless UP voted by the community. Anonymously UP vote what you like and vote OFF what you dont.
Forget about Points, Karma and Likes - your "Time Trending" is a running total of how long your posts have been popular.
Good luck and please use responsibly.