Network datasets by Katherine Ognyanova.
From the post:
Since I started posting network tutorials on this site, people will occasionally write to ask me about the included example datasets. I also get e-mails from people asking where they might find network data to use for a project or in teaching. Seems like a good idea to post a quick reply here.
The datasets included in my tutorials are mostly synthetic (or trimmed and heavily manipulated) in order to illustrate various visualization aspects in a manageable way. Feel free to use those datasets (citing or linking to the source is appreciated), but keep in mind that they are artificially generated and not the result of actual data collection. When I do use empirical data, the download files include documentation (if the data is collected by me) or clearly point to the source (if the data was collected by someone else).
If you are looking for network data, large or small, there are a number of excellent open online repositories that you can take a look at. Below is a short list (feel free to e-mail me if you have other good links, and I will add them here).
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Links to ten (10) collections of network datasets, plus suggestions on software for collecting and analyzing social network data.
Considering following her: @Ognyanova. See her website, http://kateto.net/ for additional resources.