All of the social media players typically started of by trying to achieve a significant growth in their user base. This can be measured in different forms, but typically it is expressed as MAU, number of monthly active users. Given the network effects in a social media platform it is of course very important to grow a significant size of it. However, as this brief analysis well tell, figuring out a appropriate business model is at some point of time equally important. That is, figuring out how to capitalise on the user base you hopefully managed to build and to do that without jeopardising the user experience too much.
Below is a summary of some of the key figures. All of the figures refers to second quarter 2015. Source is public information reported by the companies and Google finance in addition.