Is NOT being a social network a benefit?

I'm working on a new website project that requires users to log in to access the content, and once logged in they can publish, share and follow content.

Since logging in is a required action to gain access. I'm using social network buttons to grant new users quick registration.

I started to question if social networks are now a negative impression for new users. Should I clearly state on my landing page that this website is not a social network. That there is no way to follow other users, and that this is not a space to share personal information.

The reason I ask is that the user experience of a landing page that only lets you log in tends to be for social networks. Facebook, Google+ and Twitter all have log ins as their main landing page.