The Wetransfer of 3D model sharing. ConceptMesh.com
If you have not come across it yet, wetransfer.com allows public users to drag and drop any big files so they can be emailed to other users. This helps users send large files that would otherwise fail in typical email envirnments.
ConceptMesh.com gives public users the same type of instant access. As they are not required to login, all they need to do, is drag a 3D model to the upload area and then they are good to go.
The video below shows how easy it is to send a 3D model, FBX, STEP, IGS to others in seconds.
The service has other advanced features that allows users to collaborate and review 3D models online. Giving them the option to heighlight areas and make comments on the changes that need to be done.