@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}
}