Rockstar has confirmed it is aware of issues with the Rockstar Social Club, as well as Grand Theft Auto V's companion app.
A post on the developer's support site confirms that the Social Club is experiencing some issues, specifically with regards to account linking, stat updating and crew rosters. Rockstar is working on a solution however, and we'll be sure to let you know when everything's resolved.
Additionally, the iFruit companion app is also suffering from login errors, long loading times and unrequested data resets. The company is also working to sort this out.
Source : ign[dot]com