Today we’re introducing the ability to follow hashtags, giving you new ways to discover photos, videos and people on Instagram. Now it’s even easier to stay connected with the interests, hobbies, passions and communities you care about.
This is an excellent feature. I won’t even go into all the ways Twitter should have been first to things like this (seeing as the hashtag was invented there).
If you’re building a platform that supports hashtags you may want to consider doing something like this too.