How many tweets per week, month, etc?

gist.md

Install GetOldTweets:

$ git clone git@github.com:Jefferson-Henrique/GetOldTweets-python.git
$ cd GetOldTweets-python
$ pip install -r requirements.txt

Run the exporter with your parameters.
Documentation is at: https://github.com/Jefferson-Henrique/GetOldTweets-python

$ python Exporter.py --username "realDonaldTrump" --since 2017-01-20

Then do your grouping and export in R.
You can round dates with these lubridate methods

library(lubridate)
library(dplyr)
library(readr)

# semicolon-separated dataframe
df <- read.csv("output_got.csv", ";", header=T)

# group by week
week_groups <- df %>%
   mutate(week_name = floor_date(as.POSIXct(date), "weeks")) %>%
   group_by(week_name) %>%
   summarise(count = n())
write.csv(week_groups, "week_groups.csv")