I have two goals for webmentions. The first is to build my website to start feteching webmentions from webmention.io and to start displaying them at the bottom of posts.
The second is to build a native iOS app that can receiving webmentions from a service like webmention.io (or a person's personal website) and display it as an iOS alert. This would be integrated into the indigenous app that I'm working on, but probably won't be integrated until Version 2 in Summer 2017. That would help do for the IndieWeb what the native Twitter and Facebook clients do in allowing you to be notified about what people are talking to you.