Social media networks want more users. Of course if you’re trying to grow your social network then it makes sense that you use your users’ existing connections .. So a lot of social networks tap into the data available via Twitter, Facebook and other services.
Of course by doing this they can upset each other .. end result you see social networks blocking access to each other. Sometimes it’s pretty petty, but it’s still fascinating to watch.
The guys over at Hootsuite used a Game of Thrones style analogy to visually represent what’s been going on: