@article{zafar-tweb15, title = {{{Sampling Content from Online Social Networks: Comparing Random vs. Expert Sampling of the Twitter Stream}}}, author = {M. B. Zafar and P. Bhattacharya and N. Ganguly and K. P. Gummadi and S. Ghosh}, journal = {ACM Transactions on the Web (TWEB)}, month = {June}, number = {3}, pages = {12:1--12:33}, volume = {9}, year = {2015} }