For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Exposely - Immediately reach the largest audiences.
Dropbox - Online Sync and File Sharing
Crowdly - Crowdly is a social advocate management platform, helps brands find, rank and engage their top advocates on Facebook.
Google Drive - Access and sync your files anywhere
Jamballa - Jamballa is a platform that enables brands to reach bloggers and influencers more easily to promote their products and services, and to reach the targeted audience.
Mega - Secure File Storage and collaboration