Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On-the-fly Detection of Autogenerated Tweets   Most previous work related to tweet classification have focused on
identifying a given tweet as a spam, or to classify a Twitter user account as a
spammer or a bot. In most cases the tweet classification has taken place
offline, on a pre-collected dataset of tweets. In this paper we present an
\emph{on-the-fly} approach to classify each newly downloaded tweet as
\emph{autogenerated} or not. We define an autogenerated tweet (AGT) as a tweet
where all or parts of the natural language content is generated automatically
by a bot or other type of program.
  Our on-the-fly approach makes use of two classifiers. The first classifies a
tweet solely based on the twitter text and the tweet metadata that comes with
every tweet. It is used for tweets posted by unknown users with no available
tweet history. An unknown user also triggers a batch job to start downloading
the missing user timeline information. The second classifier is used for tweets
posted by a user where the user timeline is downloaded and available.
Initially, it will be the first classifier that handles most of the tweets.
This will gradually change and after an initialization phase where we download
historic data for the most active users, we reach a state where the second
classifier handles a vast majority of all the tweets.
  A simulation using our on-the-fly detection mechanism indicates that we can
handle Twitter streams with up to 68,000 unique users each day. The bottleneck
is the time required to download new user timelines. The AGT detection is very
accurate. In a set of 5,000 tweets we correctly classified about 98\% of all
AGTs using a subject-wise cross-validation.

2
The categories of this paper are: math
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph