Linky works with Twitter, Facebook, and App.net, and as someone who frequently updates several Facebook Pages, having the convenience of being able to write once and post everywhere is quite liberating indeed--simply tap the account header, select where you want to post, and hit Send. Several popular link shortening services like bit.ly and Google are also included, but require an account to use.
Thanks to the single sign-in feature integrated into iOS, adding Twitter and Facebook accounts is equally painless; the less-popular App.net still requires a username and password, however. I initially had a vague "credentials do not allow access to this resource" error when attempting to send tweets from my iPhone (but not my iPad), which was quickly resolved by reentering my Twitter passwords in iOS 8.4.
Packed with convenience, Linky makes sharing to social networks from an iOS device more awesome by reducing the number of steps required in the process.
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