High School Dating
(Bearman, Moody, and Stovel, 2004)
(Image by Mark Newman)
Corporate E-Mail Communication
(Adamic and Adar, 2005)
Economics 2040 / Sociology 2090 / Computer Science 2850 / Information Science 2040
Cornell University, Fall 2021
A course on how the social, technological, and natural worlds are connected,
and how the study of networks sheds light on these connections.
Topics include: how opinions, fads, and political movements
spread through society; the robustness and fragility of food webs
and financial markets; and the technology, economics, and politics
of Web information and on-line communities.
The course is designed at the introductory undergraduate level
with no formal prerequisites; it satisfies the
Arts & Sciences Social and Behavioral Analysis (SBA) distribution
and the Engineering Liberal Studies (SBA group) distribution.
Course staff and office hours
News and Announcements
- Cornell combat robotics is recruiting; applications are due
10/20. See http://www.cucombatrobotics.com/ for details.
- TEDxCornell is recruiting; they host speakers on Cornell's campus
to share "Ideas Worth Spreading". See http://www.tedxcornell.com/.
- Delta Sigma Pi, a co-ed business fraternity, is recruiting. See
https://www.dspcornell.com/ for details.
- CIS is having a partner-finding social on Sept. 9 in Gates G01:
- 7 - 8:30: 1000-2000 level courses
- 8:30 = 10: 3000+ level courses
- You can also find study partners through the Learning Strategies
- Big Red Hacks (Cornell's largest hackathon) will be held
Sept. 24-26, in-person for Cornell students, online for others
- register at https://bit.ly/3ydoWZ3
- the Cornell Mars Rover project team is looking for new members;
- Aug. 16: Cornell Mental Health Resources Guide (posted
at the request of student organizations).
- We will be using the book Networks, Crowds, and Markets
(Cambridge University Press, 2010), which Professor Easley
co-wrote with Jon Kleinberg while teaching this course over the past several
years. A complete draft is on-line at the
Web page for the book,
and the hardcopy version is for sale at the Campus Store.
- Over the past several years, we've offered an
on-line version of the course
through the edX platform. The materials from this course are now archived,
and you can access them by registering on-line at the edX site. Although you
can no longer take the edX course as a student,
by registering you get access to the videos and on-line exercises.
In the course this fall, this edX material will serve as a set of optional
resources that you may find helpful for alternate presentations as
well as a source of additional practice exercises.
Grades on the homework, blog posts, midterm,
and final will be weighted as follows:
- Homework: 40% [9 probem sets; lowest one dropped]
- Homework must be typed and submitted as PDFs using the
gradescope site, by the start of class on the days they are
due. (Gradescope can also be accessed from the course Canvas site.)
- You should sign up on the gradescope site for CS 2850
(even if you are taking it with a different course number). The site will
ask you for an entry code; it is X3N6BN.
If you have any
difficulties, let us know right away.
- Midterm: 20% (on October 4, in class)
- Final Exam: 30% (date TBD)
- Blog Posts: 10%
- iClicker participation: 0% (score will be considered for
- We'll use clickers in lecture. You must use a clicker
from the iClicker system.
- Academic integrity guidelines require that you may only use your
own registered clicker during class.
- The process for registering an
iClicker is described in the
Class Discussion on Ed
We will be using Ed as a discussion forum for the class. You can
access it through the course Canvas site (you should see a link
on the left side of the course home page, at the bottom).
You are expected to maintain the utmost level of academic integrity in the
course. Any violation of the code of academic integrity will be penalized
You are allowed to collaborate on the homework to the extent of formulating
ideas as a group. However, you must write up the solutions to each problem
set completely on your own, and understand what you are writing. You must
also list the names of everyone that you discussed the problem set with.
Collaboration is not allowed on the other parts of the coursework.
Finally, plagiarism deserves special mention here. Including
text from other sources in written assignments without quoting
it and providing a proper citation constitutes plagiarism, and it
is a serious form of academic misconduct. This includes cases in
which no full sentence has been copied from the original source,
but large amounts of text have been closely paraphrased without
proper attribution. To get a better sense for what is allowed, it
is highly recommended that you consult the
guidelines maintained by Cornell
on this topic. It is also worth noting that search engines
have made plagiarism much easier to detect. This is a very serious
issue; instances of plagiarism will very likely result in failing