I blocked everything from Viddy and Socialcam on my timeline because I can't watch the videos that my friends are sharing without installing their stupid app.
Same goes for all of these newspaper apps that make you install in order to read an article a friend shared on his timeline.
They're acquiring users that don't know what they're doing to make their numbers look better and I hate it!!
(tip- if you want to install and watch/read, change the settings to "only me" that way even if it posts without permission, it's not visible to others)