Emojis wherever you create Content
Not every Linchpin will be able to handle Emojis at all - the database it's running on has to meet certain criteria. But if it does - why not embellish your Content with Emojis? React with Emojis in your comments on news, use them in the microblog, basically wherever you want people to interact with each other.
Emojis are common in so many apps, people are used to using them.
Would you activate that feature in your Linchpin?