@inproceedings{Comarela:2012,
 author = {Comarela, Giovanni and Crovella, Mark and Almeida, Virgilio and Benevenuto, Fabricio},
 title = {Understanding factors that affect response rates in twitter},
 booktitle = {Proceedings of the 23rd ACM conference on Hypertext and social media},
 series = {HT '12},
 year = {2012},
 isbn = {978-1-4503-1335-3},
 location = {Milwaukee, Wisconsin, USA},
 pages = {123--132},
 numpages = {10},
 url = {http://doi.acm.org/10.1145/2309996.2310017},
 doi = {10.1145/2309996.2310017},
 keywords = {social networks, timeline, twitter},
}