Facebook groups, Asana, Fetchnotes, etc are great for cases where you can get a whole team/group/family on one or a couple communication platforms. It's much harder to get your friends to adopt a new tool, like the different pre-iMessage BBM-like services, unless you can convince them they need it for a specific task/project, or the tool has a 'cool' value-add (Voxer-walkie talkie).