1. Web scraping, web harvesting, or web data extraction is data scraping used for extracting data from websites. Web scraping software may access the World Wide Web directly using the Hypertext Transfer Protocol, or through a web browser.
2. A web crawler (also known as a web spider or web robot) is a program or automated script that browses the World Wide Web in a methodical, automated manner. This process is called web crawling or spidering.

3. Yes.
4. Yes, using Tweepy.
5. Yes, by using the Selenium-Python web driver. Other libraries are also available, such as PhantomJS and dryscrape.