Table 1: tweets
***_**** | ***_**** ----------------+-------------------------- ****_** | ****** *****_** | ****** *****_*****_** | ****** *******_** | ********* ******* | *******(280) -- *** ** 280 *****
Question 191
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***********
- ***** * ***** ** ****** *** ******* ****** ** ******* ** ********** ****** *** ********** 2001.
- *** ******* ****** ** *******: ***** ****** ** *******/****** ** ****** ****** *****.
- ****** **** ********* *** ******* ****** ** *** ********* ****.
Table 2: twitter_experiment_users
***** **** **** **** ******** **** * ********* ***** ** *** *** **** ** *******. * **** *** **** ****** ** ****** ********* ** ******* ***** ** * ****** **********.
***_**** | ***_**** --------------+-------------------------- ***_** | ****** ****_** | ****** **_********* | *******
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