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Do you know of any up-to-date estimation of the mean reciprocity ratio on Twitter (follower / following)?
Kwak et al, 2010, on 2009 data, had computed 22.1%
(see below for a more detailed excerpt)
Now the uses (and the service) have quite changed since, but i haven’t found more recent structural measures of this kind on a significant part of the Twitter network, be it by people at Twitter or whatever.
Gabielkov et al, 2014, did a massive crawl of 2012 data, but unfortunately they focus mainly on extreme values (accounts with no followers, etc.) and on the macroscopic structure of the graph (strongly connected components etc.)
Speaking of changes on uses, it’s the first message i’m sending here after, i don’t know, maybe five years (ok, even back then i’ve never had a chance of reaching a hundredth of Barry Wellman’s posting frequency).
I remember tons of messages each day on many technical debates and inspirational ideas, now this list looks like a desert full of ads. I may have missed something, where have you all gone? Twitter maybe?
Hope to hear from some network roadrunner…
Kwak et al, 2010, p. 3:
« In fact Twitter shows a low level of reciprocity; 77.9% of user pairs with any link between them are connected one-way, and only 22.1% have recip- rocal relationship between them. We call those r-friends of a user as they reciprocate a user’s following. Previous studies have reported much higher reciprocity on other social networking services: 68% on Flickr  and 84% on Yahoo! 360 .
Moreover, 67.6% of users are not followed by any of their fol- lowings in Twitter. We conjecture that for these users Twitter is rather a source of information than a social networking site. Fur- ther validation is out of the scope of this paper and we leave it for future work. »
Christophe Prieur, [log in to unmask]
Telecom Paris, dept. Sciences Éco et Sociales
Institut Polytechnique de Paris, Palaiseau
I3, Institut Interdisciplinaire de l’Innovation, CNRS (UMR 9217)
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