Update readme

README.md

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 # FB_tagged_photos_downloader
- Download photos and videos you're tagged in on Facebook
+
+### What
+
+I want to close my FB account and save all the photos I'm tagged. Not only mines
+### Problem
+
+FB, in export data, don't save these images. Only the one that you own.
+
+### How to do it
+
+Download photos and videos you're tagged in on Facebook
+Code developed starting from [this thread](https://gist.github.com/david-crespo/89baec40d680a17ebc2a4d622c5fc0cf)
+
+
+### Setup On Linux
+
+This requires Python 3.
+
+1. Make sure you have `curl` (Linux and Mac likely already have it)
+2. `mkdir photos videos` in the same directory as the script
+3. `pip3 install selenium`
+4. Download the [ChromeDriver](http://chromedriver.chromium.org/) executable and put it somewhere in your PATH
+5. Set `FB_USER_ID` and `CHROME_PROFILE_PATH` in `helpers.py`
+6. Set `CONTAINER_SELECTOR` (see below)
+
+### `CONTAINER_SELECTOR`
+
+The photo downloader relies on a particular class that is likely to change over time because it's auto-generated by FB's frontend build process. It was `.atb` when I wrote this but it'll probably change all the time. You'll have to dig into the source of the photo page to figure out what the right class is.
+
+### Running it
+
+`python3 tagged_photos.py` or `python3 tagged_videos.py`
+
+### Improve TODO
+
+Parallelize download. Not know maybe using Celery+Radis.